I'm sticking with PS3s, I can't justify the extra cost and I'm not one for skimping on tyres either. A Golf just doesnt warrant tyres that we designed for 911 Turbos and 599 GTOs. I'm just about to replace my first full set of PS3s and whilst they've not out lasted the ContiSportContacts they replaced (Contis always seem to be hard and noisey), they are much much better tyres in every other respect.
A lot of forum waffle seems to suggest that the PSS is the replacement for the PS2 when in actual fact, the PS3 it the true successor. The PSS is a completely new, high-end tyre as the PS2 was too compromised trying to cater for GTIs and GTOs.
I'm not disputing that the PSS isn't a great tyre, all the reviews I've read suggest that they even better than the PS3, which means they must be good. For road driving though, the PS3 is more than adequate - wet grip it supposed to be massively improved over the PS2. Even Michelin state they are intended for sports car and high power saloons, so if they're good enough for an M3/M5 - it's good enough for me. For the track, I'd use something more focused and track specific i.e. the PS Cup.