I still have a set of RSi2 heads somewhere. Good sticks, a little hollow sounding in the long irons but that's the sound these daysI had the RSi2's for a bit, and thought they were great when they weren't having face issues...but man I never saw outside of THPers anyone who had the RSi1's or 2's on the course.
As for PSi's, I don't think I've ever seen someone playing them.