I did an 8-week rotation of PS and then a 4-week rotation of S&H.
During the 8 weeks of PS, I had strength gains and the beginnings of tricep and shoulder development, and at the end of my 2nd week of S&H, my triceps were considerably more defined and my shoulders literally popped up overnight!
I believe I probably would have had the same development eventually if I had continued a longer PS Series rotation, but I tend to lose ground (weight loss wise) if I remain on a particular rotation too long, so I change up every 6-8 weeks or so. But I think the S&H rotation really accelerated my muscle development.
Donna