Just got mine `nx connected them in parallel with P7 Wireless (over bluetooth) to my Macbook to compare.
First impressions:
1) everything sounds muffled and cheap
2) ANC makes everything sound even more muffled
3) bass response is close to P7W, 160Hz+ region seems more emphasized while the bottom is weaker. Doesn't sound natural.
4) ANC is weak and the profiles it has make no sense (I don't have a plane though)
5) they randomly start/stop music when I'm moving around. No glasses.
6) comfort-wise, they are more grippy, but they will likely loosen-up a bit. Earcups are weird and my ears are touching them from inside. I can tell they will be much hotter than the P7W. Not as comfortable as the P7W.
7) build quality is good but not as good as the P7W, even the metal looks like plastic. Few months forward the P7W will still look the same, those will show wear and tear for sure.
Overall I'm VERY disappointed
Second impressions after playing with them for a while
8) USB audio works, but is 48kHz/16bit top - no hi-res ;-( Sound is indistinguishable from Bluetooth AAC or aptX (at least to me). I get some weird gaps in playback every once in a while, those don't happen with BT.
9) SQ is not that bad without ANC but really turns to mush with ANC on. Sounds like a very badly compressed MP3 (think 64kbit) played through a pipe.
Whoever had a P7W will be able to tell it's nowhere near as good from the first time they turn it on and hear the same familiar power-on chime the P7W has - that sound tells you everything you need to know because it's muffled badly and simply sounds cheap.
My recommendation: Get a P7 Wireless, return the PX if you can, those are $150 headphones at best. If all you wanted is P7W with ANC, those cans are NOT it.
Philips SHB8850 I also have are better headphones than this. That should tell you something...