I've had a BV14-55 for a few weeks now ( a month i think).
Quick note re software and updates - yes the OS has been a bit buggy. First time i;ve bought a first release, so been a bit annoying - similar issues to those mentioned above, all of which have been fed back to B&O. So, yes PIN code issues (I've turned mine off), occasional unresponsiveness of the OS / menu system, though by far the biggest issue i have had is the sound cutting out, remedied by powering on and then off, which i regard as pretty unacceptable really, but assured it will be fixed in the upcoming (week 41 update as its called). The update next week will not bring multi-room, that arrives late November, and thats not guaranteed, its more to clean up the operation of the current functionality, so will be welcome in that sense.
In general though the OS is clean enough, and still retains the simplicity of what you would expect from B&O, albeit with a bit of Android nonsense thrown in. Its not the mess i thought it would be at all, playing with settings is very straight-forward, and i don't use any of the Android TV apps, but use external boxes. The Android TV apps look terrible to me - some look bad beyond belief, example being the TuneIn Radio app, which looks like something with 10 minutes of coding experience wrote. Spotify is better, but still poor compared to the Fire TV version. YouTube is fine, but again not as slick as the Apple Tv or Fire TV versions, but useable. Android TV is still young, so may get better, but i wouldn't hold my breath. ** i would add that Googlecasting to the BV14 is a very nice feature....
I'll address the sound first - this all depends on your individual use case of course, but i use mine in my bedroom, which measures about 6m*5m. The sound is pretty good i think for my bedroom, its certainly the best i;ve heard on a standalone TV, and at times i;ve been impressed by the range and separation it can produce. Not sure i will need to add the nearby A9 into the mix, once the multi room becomes enabled.....occasionally i guess, but not often. I like volume a bit louder than most people i know, but i've rarely if ever gone past half way on the volume scale (generally its on between 45-50 vs max 90). If i had the BV14 in my lounge, personally i would be adding speakers, but i like a big room filling sound.
As for picture quality, i'm an avowed plasma man (its just not the same all round performer that my BV12-65 is), and as my first LCD/LED i've had to tweak a couple of settings to get rid of the aspects of LCD/LED i dislike. Mainly the judder cancellation, so the horrible soap opera effects are minimised. Generally its a very good picture, Sky Sports HD looks great, yes its not as rich colour palette wise as my 12-65 to my eyes, but its good. Dont watch much SD coverage so can't judge its ability too much.
As for non-Sky sources - much the same really, Netflix HD and 4K look very good - no one should have any real complaints here. Not all of the 4K content looks the same - Netflix have some nature-type 4k shorts that look really superb, though at the same time watching a UDH show on Amazon Prime didnt look much of a step up, and occasionally a few of the darker scenes looked wrong - whether it was the content or the BV14 i didn't know. Generally not had problems of this nature though.
All in all, i wouldnt go for a BV11 - the BV14 looked better to me on the same HD content when i spent some time in the showroom.
Anyway, pretty happy, short term bugs notwithstanding. Does the job i want it to, looks fantastic, and the sound is obviously better than other TVs. Looking at the LG E6/G6 (i.e. with HDR), does make me salivate for what HDR can do on an OLED, they're just amazing, but no hurry there. All the conversations i have had with B&O suggest the B&O /LG screen is far from certain for 2017, as questions remain over the longevity of OLED screens....
Anyway, apologies for the length of post....