Originally Posted by Braap
These tires will be very different. Disclaimer; I have not driven on the ZII's, but have used the Z1's.
I drove the PSS's during the 2011 season and found them to be great tires... when warm. They were super solid on the track and were even very good in the rain.
The selling point of the Z1's and the ZII's is that they have a massive amount of grip even when cold. They work really well for autoX events because of the big gaps between the short runs.
I've been on the AD08's recently and they're a lot like the Z1's. Lots of cold grip, even better with some heat.