I've been through it twice now and am very pleased with the muscle development and strength that I was able to acheive. Be sure to take care of your joints if you have done a lot of weight lifting in the past couple of years because it is hell on your joints even if you are supplementing. I got tendenitis in my right shoulder (1-arm pushups) the second time around and had to let it rest for five months. I haven't done crap during that time and my ab muscles are still showing while pushups and pullups are a breeze.
Mass Fuzion Recovery drinks mixed with PRO 5 strawberry protein shakes made me feel like he-man for 6 months straight!