I almost got the PSS for my Z. But I decided on the Pilot Sport A/S3s because of the better mileage warranty and the slightly better wet traction rating (In Florida, wet traction is pretty much everything), though the margin was pretty slim between them. That, and I got the A/S3s for a little bit less ($1160 installed).

I had noticed a small difference in steering, but had mainly chalked that up to switching from a run-flat to a normal tire. Wet traction is awesome on both tires though. Would highly recommend either one, as long as you are willing to part with the money that is.

I've found that my steering is pretty neutral and the car does great on the track. I think any car will understeer if you come into a corner to fast though...