All B&W FPM speakers including the PV1 are hard to find reviews for. The PV1 is a great sub, but cant be compared to any other becuase of its stylish design. If you are not buying it for 50% looks then you money may be better spent on something else.
The only comparison you can make are products from B&O (which goes for twice as much as the PV1 BTW), as there are no other subs that are really stylish.
Look at this this way. You can buy a couch for 1,000 that is comfortable, but you can also buy one for 10k that is jaw dropping.
I just orderd the B&W FPM 6s for the front and FPM 2's for the surround. From the reviews I have read about the PV1 it is very good, but I will be buying it becuase of the looks.