I have the PDR option which I use for video and data collection on track.
I will caveat that this is highly personal and subjective. The main takeaway for me was that the PP didn't affect ride quality adversely enough that I wouldn't want it on the road. I really won't know the difference in track performance unless I get a chance to drive
@jvp's car on track at a reasonable pace. Given the quality of GM's engineers, I'm sure it is an improvement.
If the car was never going to touch a track where you can truly push the limits of the car, I don't think I'd buy the PP. The standard suspension is already more performance than you can really exploit on public roads, and the ride quality is excellent.