✅ Trip Verified | This review is based on exit row 31 on the Boeing 787-8. I was in seat 31J from Vancouver to Brisbane, a nearly 15 hour flight. I specifically chose this seat due to the extra legroom it provided. On this particular flight it was $150 extra to select the seat as it is classified as preferred (not to be confused with premium economy). When we boarded the plane there was a small overhead bin above our row that was able to fit all of my and my partners bags (2 backpacks, a suit bag and a shopping bag of snacks) as we were unable to store anything for takeoff. I was expecting brief instructions from one of the flight attendants on how the emergency door worked as we were right beside it however this never happened, I assume because there was a flight attendant jump seat facing us on the other side of the exit. Once the flight took off and the seatbelt sign was off we were able to get a few things from the overhead bin above and had no issues from the flight attendants storing the on the floor, we just made sure there were right against our seat so as to not block the emergency exit. The tray tables were in the armrests which made it difficult to get too if the person beside you was asleep with their arm on the opening. The entertainment screen was a folding arm below the armrest that swung up in front of you. For me it was not high enough and it did not quite sit centred in front of you which was slightly annoying.There were also 2 power supply outlets located on either side of the middle seat, nearly at the ground. I consider myself a tall with an average build (190cm 90kg, 6' 2" 200lb) but the seats were exceptionally comfortable compared to other economy seats. The recline was average and the moveable headrest was ideal for someone as tall as I am. With the new 787s the seats recline in a way where your seat moves forward slightly when you recline the back. I can see this being an issue when you already have limited legroom, but for this seat it was a nice touch as it seemed to be more comfortable than just the back reclining. The extra legroom was the true winner though. You basically had unlimited legroom as the next row of seats was about 1.5 to 2 meters away. I could stretch my legs out as much as I want and with the unique way the seats recline I believe it was the most comfortable you could be trying to sleep in a seated position. The biggest downside was that in the centre was the washrooms, one on each aisle. Although you could not smell anything for the duration of the flight, the door was quite loud when people let is slam. Also people would line up for the washroom in the area directly in front of you. At one point in the middle of a deep sleep a gentleman tripped over my legs as he was waiting in line and fell right on top of me! Other than that the flight went smoothly, I just put some earplugs in and that drowned out most of the people, children and washroom door slamming. I managed to get about 10 hours of sleep in 2 different periods, which made the 15 hour flight fly by.
Air Canada have revamped their pods in business class and the result is not good. They are narrower than before and taper very abruptly at the end, which means your feet are crammed together uncomfortably. I got very little sleep and had little luck distracting myself with the inflight entertainment,which now appears to be little more than an afterthought. The music choices were miserably poor: just four or five pieces in each category. On the plus side, the food was much better than a year ago.
Some trains have seats in open-plan saloons, indeed most modern trains have this sort of seating.  Some trains, often older ones and often in eastern Europe, have seats in traditional 6-seater compartments with a side corridor running the length of the car.  There are sliding (but non-lockable) doors to each compartment.  Very occasionally you'll find both sorts of seating on one train, and some booking systems (such as the German Railways site bahn.de or Austrian site oebb.at) will ask you which you prefer.  Unless you're in a group of 5 or 6 people, most travellers prefer open-plan saloon seating, which also gives you a better view out as you can view diagonally forwards and backwards through all the coach windows, not just directly sideways through your own window.
For a newly designed plane I was surprised that the seats very narrow and legroom limited compared to older planes. I am 6'3" and 210lbs and I was unable to stretch both feet out at the same time. I took the advice of a previous reviewer at changed my seat to 60A as there were 2 seats rather than 3 in the outside row. I had more shoulder room as I could lean to one side can't imagine 5 hours in a row with 10 seats across.

In addition, due to cramming so many seats into the Econ, there's less lavatories (long line-ups), no duty free onboard (no room), not enough room for carryon, and very poor service with long waits for food. Carryon bins were full half way through the boarding and it was chaos trying to fit your stuff. Forget about bringing 2 bags or jacket with you expecting it to fit overhead, meaning you need to keep those in your tiny seat further making it less comfortable.

Aside from the obvious fact that being seated next to or right behind the toilet can result in unpleasant odours etc wafting around you, the toilet flush is extremely noisy on most aircraft, and you will find this incessant noise interruption very annoying after several hours of constant repetition. During the darkness / sleep periods you might also tire of the light intrusion every time passengers open the washroom door – and similar to some bulkhead/exit seat positions, you will find that there are often a lot of passengers milling around your seat area as they queue for the washroom.
You can clearly see this is an attempt to add more per-flight profit just by virtue of increasing the number of seats. Unfortunately, this means a few things for passengers: First Class features fewer seats meaning those seeking a Status upgrade are less likely to be successful. Premium Economy gets you the First Class food, but not the wine & liquor selection - and is only really worth the extra expense if you get seats A, C, H or K ... D, E, F, G are not really worth it in my opinion. The seats are more comfortable (mind you, I'm 5'6" so the overhead bin would be comfortable for me) than Economy, but the middle row still seemed crammed. Economy ... was ... just ... terrible. Even for a shorter guy like me, I was uncomfortable for the duration of the seven hour flight - my heart went out to the guy beside me who was easily over 6'.
Another important point with the extended space around the exit rows, is that on some flights you might find that passengers from elsewhere in the cabin decide that this is a good place to congregate and chat, do their stretching exercises etc, and it can therefore prove a rather busy place. It is also always worth watching out for those middle seat rows in the aircraft that look like there is a lot of legroom – this might be the case, but you can find that your hoped for space in front is being used as a cabin cross-over passage, as passengers go to the washrooms etc.

Most airlines now charge an additional fee to sit in the exit rows, others will allocate at check-in (remarkably some airlines still favour these seats for much taller passengers!). You do get a lot more legroom in an exit seat, but on the downside there are a few points to remember. You will not be allowed to keep any items of hand-luggage (even books etc sometimes) by your seat/footwell area during landing and take-off periods, and as the bins above your seat may be full by the time you realise, you will have to hope for a cooperative cabin crew that will take these items off you at these periods and return them after take-off and landing! 

@Lucky: “While I imagine these planes will still be primarily used for shorter flights, the decision to fly them transatlantic is interesting.” AC uses these for everything and anything since they freely swap between their widebodies and narrowbodies on flights in North America. So, in other words, we’ll be riding this from Halifax to Vancouver (5.5 hours), Montreal to SFO (5 hours), etc. etc. Lots of looooong flights, so I don’t see why they similarly lengthy European flight is any different.
✅ Trip Verified | We travelled Air Canada from Montreal to LAX yesterday in Business Class. The plane is a new Boeing 737. It seems like Air Canada is following the Rouge tradition by having the most uncomfortable seats imaginable even on a brand new plane. The thickness of the back cushion is very thin and there is a horizontal rod that is placed it seems to cause maximum discomfort. This flight is 6 hours! The foot rests are also extraordinarily cheap and won’t go down unless you get on your knees and manipulate it manually. Also, just like horrible Rouge, the seat posts are positioned so that you cannot store any hand luggage in front of your seat . The middle section has to be shared by seat neighbors. Air Canada used to be our favorite airline and now we have advised our travel agent to research any alternative to Air Canada and Rouge.
In addition, due to cramming so many seats into the Econ, there's less lavatories (long line-ups), no duty free onboard (no room), not enough room for carryon, and very poor service with long waits for food. Carryon bins were full half way through the boarding and it was chaos trying to fit your stuff. Forget about bringing 2 bags or jacket with you expecting it to fit overhead, meaning you need to keep those in your tiny seat further making it less comfortable.
✅ Trip Verified | The most uncomfortable long haul flight I have been on. I was seated in row 38, an aisle seat on the Boeing 787-9. I am fairly close to average size (barely 6 feet tall and 185 pounds), so not tiny but neither am I a giant by any means. My knees were just about touching the seat in front of me, the seats are very narrow, and thankfully the passenger seated in the middle seat was not large but he did fill the seat and needed all his elbow room. The seats are very short, offering little or no support to the thighs. This adds to the discomfort, particularly on a long flight. I could not stretch both my legs out fully at all while seated. Trying to use some of the aisle is next to impossible due to the extremely narrow aisles. There is barely room for the refreshment carts to pass. I spent a great deal of time on the flight moving my arm and shoulder inwards as the carts and other passengers were passing and bumping into me and there was no space. Seat backs are very thin and offer no support either. Due to all the factors mentioned, I found sleep to be impossible. The passenger at the window seat managed about an hour's sleep but basically had the same complaint, and needed muscle relaxers for her back towards the end of the flight. Anyone getting out of their seats found it necessary to pull on the seat in front of them for balance and leverage. For relief, I got up to stand and stretch at the rear of the plane 3 times on the eastbound flight and 4 times on the westbound leg. Also, on the outbound flight, our connection was a little late so we went straight to board our London flight without buying snacks, etc. Be warned, we found out on board that in economy you cannot buy snacks. You have to content yourself with the dinner and continental breakfast and I think you get a very small bag of pretzels with a drink. Cabin is beautiful. The in-flight entertainment system was excellent, although some people were asking why wi-fi was not available. The selection of movies, TV programs, and interactive games was OK for me. In summary, I will do everything I possibly can to avoid using this aircraft again. If it even means connecting through another city, I will do it. Three days later, I am still feeling the effects.
Also, the exit row seats will not have a PTV entertainment screen on the back of the seat in front (as most seats), but will have the video screen stored in the armrest – similar for the meal tray table which will be stored in your armrest. Because of this design layout, you might find that the actual seat width is less than ordinary seats, and it can be quite cumbersome using the PTV and tray tables – guess it is a case of measuring that against the benefit of extended leg space you will get.