Interesting, I own a pair of Bowers and Wilkins PX headphones and they sound great, no complaints aside from the year the firmware got stuck in some failure state and they wouldn't reboot/function until the battery died.
I have the same issue with my PX, every two months or so I have to use the paper clip to hard reboot them. Kind of annoying to need to do for a $400 pair of headphones, but they sound great, look good, and are very comfortable.