Sonic Defender
Headphoneus Supremus
So, today I had a chance to briefly audition the new wireless B&W P7. I must say the Bluetooth sound is very impressive. I agree with what others have reported here about the sound quality. I found the bass and soundstage to be slightly but noticeably better than the Onkyo H500BT. The P7 sound is lush and mellow and definitely warm--it was just right for my taste though I could see it might be too much for some. If you prefer a more neutral sound then the Onkyo's are better. Then there's the value equation: the P7 retails in the U.S. for $399 compared to $199 for the H500BT. They are only slightly better sounding than the Onkyo's and definitely not as portable. The P7 is very stylish though and they appear to have excellent build quality (the H500BT is well-built as well though).
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I also quickly compared the wireless P7 on Bluetooth to the previous wired P7 and the wireless P7 sounded much better (even streaming) than the previous one did (wired.)
I agree with everything you have said, and in terms of bang for the buck, the H500BT is the winner, but just looking at overall sound quality, the P7 wins, but not by a landslide at all, the 500BT really does hold it's own and that is why I remain on the fence about selling it. The 500BT is also very much more portable and for using outdoors in the summer heat it totally is the better choice. I think in the summer the P7 can only be used inside with air conditioning, otherwise I'm sure you would sweat to death.