No, haven't heard them both, just done a lot of research and found comments like:-
"Whilst the design and build quality of the PV1 are beyond reproach, unless you have the need for a sub with exceptionally clean upper bass because you have very small satellite speakers, then the PV1 is actually bettered (unfortunately, by quite a margin) by the likes of the BK-XLS-200 for £290.
The PV1's main problems are that it was designed to answer a number of engineering problems that aren't actually an issue in subs of a comparable size or performance.
Opposed drivers to cancel vibration? A well made sub is quite capable of providing enough mass to render the moving mass of it's driver an irrelevance.
Spherical cabinet to cope pressure induced resonance? Any well engineered sub of a similar size has cabinet dimensions too small to resonate within the sub bass frequencies.
If it were twice the volume and sported 10" drivers, then we'd have something worth talking about, but in reality, it doesn't actually offer anything other than a style based argument over B&W's own ASW-675 for considerably less money."
I know the aesthetics are subjective but I'd much prefer to have a beautifully made timber cabinet sitting in my living room than a look-at-me metal sphere.