I've used my stroke lab for two rounds now and like it a lot. I don't know as I get any extra feedback through the shaft per se, but the swing feels very nicely balanced and I haven't yet seen the pull off line I saw with my Scotty on occasion (at least once a round). The feel off the face feels much improved over my old Scotty and the ball has a better roll too.
I managed 34 holes without a 3 putt in my first couple of outings with my R Ball - unheard of for me. The numbers in the fitting were compelling and it felt so easy to "swing" and for the first time I felt a putter trying to forgive a less than perfect take-away (those nervy slightly shaky wafty ones)!
The shaft does feel like it works and the balance feels great. In my case the R Ball head meant my alignment went from 2 degrees closed to pretty much spot on every time.