These replaced the PS2s on my M3, and the PS2s were great tires. These appear to be even better. Never mind that they're a) cheaper, and b) have a tread life warranty that isn't invalidated by the staggered tire setup, the tires themselves are great.
So far they've been on the highway (quiet, comfortable, stable), regular city (ditto, together with good traction), but they really shined in a spirited back country run yesterday. Down my favorite country road, I waited for the M3s slight understeer to appear (it's easily correctable with throttle, but noticeable), and it didn't. Maybe I'm just being too cautious on the new tires, I thought, so sped up. And even at normal (fast) speed, both the understeer and reaction to throttle were reduced due to grip. You could still feel it, but it was more like an observation than something to be corrected - only in a really tight decreasing radius turn was significant throttle required, and the back-end rotated like normal.
I will say there's a bit of a weird sensation, that I may be imagining after reading the Tire Rack test. When you enter the corner, you almost feel there's less traction - less initial bite. But as you run harder through the turn, it's almost as if the traction increases too, and you can turn as hard as you want to.
Anyway, I'm sold - great tires.