Having been on the 787 quite a few times, by experiences as as thus:
* It's just another tube with wings. Does have rather tall windows
* Boeing has finally made an aircraft that's almost as quiet as an Airbus
* Felt no different walking off the aircraft than any other aircraft (i.e. didn't fell any effects of lower cabin altitude and higher humidity
From a passenger perspective, nothing to write home about then. But I'm sure the bean counters love it, when it's actually flying that is; some friends of mine have just suffered a 24-hour tech delay on QR. Of the 6 legs I've done, only 2 were on time and 1 was 4+ hours delayed on technical grounds. All with the same operator (QR).