Well, I recall seeing a lot of different opinions on these. For that matter tirerack's test seem pretty positive. It appears that there is a distinction to be made between the plain P6000 and the P6000 Sport Veloce.
I would like to hear more b/c I would be interested in the 235/50/16 size.
Maybe tirerack can clarify - the test in 225/50/16 appeared to indicate that the tire size may affect the quality of the tire.