I flew on the 787 on an ANA flight from Narita to Seattle. I'll give you my experience -- it might vary depending on what airline you fly. I like planes and new technology, so I thought it was pretty awesome.
The overhead bins are huge and easy to get your things in and out.
Since the cabin is so spacious, the overhead bins are a bit high. So, they have these steps behind every seat. I always hate it when people step on my seat.
The touchscreens were bigger than any others I've used on an airplane. They have multiplayer games, and you can chat with anybody else on the plane as long as you know their seat number.
The digitally-dimming windows were cool ... but it was frustrating that it takes a few minutes after you change it to actually adjust completely.
None of the seats recline. Instead, the bottom of the seat slides forward. This setup was slightly less comfortable because it puts your body in a slightly awkward position, and you have to readjust your seat belt. The advantage is that the guy in front of you doesn't lean his seat back into your space and knock your food off the tray.
Each seat had a lot of personal space. Maybe even too much space. I had a window seat, so I was looking forward to getting cozy with my head against the window and getting some sleep. No such luck: the window was so far away that my head would just fall through.More questions on Air Travel: