@DIL It would be hard to say, because so many things have changed at once: going from a non-staggered 19x8 to a staggered 20x9 and 20x10.5(!!!) and the old Goodyear Eagle's had about 20K miles on them. Stepping up to 20" rims, I was expecting a bit more harshness, but honestly, I didn't notice much difference (I have springs not air, so the car's a bit stiff to begin with). I think the overall feel is a bit "crisper" (which I'd also expect with any new set of tires) than the old worn out ones, and doing some slaloms on the street, it's definitely got grip. I don't notice any more or less road noise than before, occasionally I have some rattles in the cabin, both before and after the change. If you measured it, probably some things have improved with the lighter rims / wider tires / better compound, but with normal daily driving, nothing obvious is hitting me. The PS4's have a fuzzy velvet-like texture on the sidewall, that's fun to touch
Cost-wise, not much difference from the Continental or Pirelli options.
In some sense, I suppose the best testament to how well the new PS4's work, is that my new 20's feel about the same as the 19's. Day-to-day, I'm not sacrificing anything by going with the PS4's, and hopefully in those times when I am pushing the car to it's limits, I'm getting a little something extra by going with the Michelin's.