Wife has the Bridgestones, which came with the car as CPO. Got 14K miles on the rears and probably could have gotten another 1-2K but she had a track day coming up and I didn't want to get DQ'd due to bald(ing) tires. Fronts still look great. Seems to be a nice tire, great handling, fairly quiet (her car is a Cab), and if she can indeed get another 16K miles out of the old fronts and new rears, pretty long-lasting as max performance tires go. No frame of reference for comparison as she's not had the PSS's ... yet ... .

Porsche Bridgestones aren't SO4's. They are re050s. Completely different tires. Your car would not be cpo without porsche spec tires.