Early impressions:
BLUETOOTH WIRELESS HEADPHONES WOO HOOO! It is really liberating to be untethered. I can leave my devices where they are and move pretty much anywhere around the house..
I spent a few hours last night A/B/Ying the PX, WH1000XM2, and Sony MDR 7520 (wired). Mostly rock music: The Damned, David Bowie, The Police, Rush..and a little bit of hip hop to highlight the lows: Tribe Called Quest. I also listened to an MLB.tv broadcast which is something I do a lot around the house.
The PX are very enjoyable and certainly detailed. I have to say, though, that I feel that detail and airiness are primarily due to a hyped high end (7k+) and that these might be a tad heavy on sizzle. Cymbals are maybe a bit too prominent. On the other end of the spectrum the bass seems to lack a bit of heft compared to the 1000s, which so far I think might have a more suitable and balanced signature for my tastes and they still provide good detail. The PX almost sound a bit tinny right after switching to them from the Sonys but I get used to them after a few minutes and find them perfectly enjoyable. The 7520s, for me, were sitting right in the middle of the two like a perfect bowl of porridge, but the other two definitely sound good enough that I'm happy in most situations to make the tradeoff for wireless convenience.
That said, I really WANT to prefer the PX because they are just a nice piece of workmanship. Really beautiful. B&W emphasize the need for burn in and I definitely recognize the need to acclimate to new phones or speakers. So I'm hoping that they will get better and really smooth out across the spectrum for me. I will make sure they get at least 24 hours of burn in before drawing any conclusions about SQ.
Features are nice on both. My favorite player to use at home is Roon and unfortunately it and both these phones don't really play together. I will contact Roon to request that they build better BT phone support into their code. Listening on my iMac, the PX sensor would not stop Roon when I took the phones off, and doubly frustrating, they would actually open and start playing iTunes on top of Roon when I put them back on. So I had to shut off the sensor. Not really a big deal. The PX played a lot better with my iOS devices w/ iTunes or Tidal. I dig the touch features on the 1000s--I prefer it to buttons for transport functions. I'd also give them an edge on comfort and NC performance, but really both are just fine and a big leap forward for me in terms of features. SQ is going to decide which one stays with me, and I'm rooting for the PX. But honestly, if the headphone police shook me down for one of the two right this second, I might have to surrender the PX.
Will update after more listening/burn in.