[smmmurf]

I'm going to be the sole dissenter here. I like the way the car rides and handles on PS2's better.

I have a stock M3 sedan with approximately -1.5 negative camber all around and 1/16th toe in front.
PSS on RAC Monolites 18" 245/40R18 front 265/40R18 rear
PS2 on OEM 18" with OEM sizes, 245/40R18 front 265/40R18 rear

PSS:
More grip wet and dry
Longer wear (looks like it's going to last 20-30% longer)
Car feels "bound up." Requires about 75% throttle to break the car loose in 2nd gear turns.
Harsher impacts on broken pavement and potholes.

PS2:
Less grip wet and dry
Faster wear
Car is more neutral and breaks away with about 50% throttle in 2nd gear turns.
Smoother ride with less crashing noises over bumps.

I think the PSS may be a better for people with stiffer (aftermarket or ZCP) suspension. To me, the PSS is a bit too grippy for the shocks/springs on a standard, stock M3 causing additional body roll. The car is more playful on PS2's, IMO.

The difference is not huge but I will probably burn up my PS2's before I go back to the PSS's (I have several sets of wheels/tires in the garage). For the money, I'd probably go with the PSS's since the OEM PS2's are ridiculously priced.