My friend and I are trying it. We are both endomorphs so we figure Endothil is for us. GNC told us we can get our $$ back if we keep our receipt and return any unused portion. So we were like "what the heck, let's try it" because we work out 6 days a week and really haven't had any noticible gains in quite a while and rarely get sore. We took before photos and will be taking some after as well once we hit 6 weeks or if it doesn't work...then no pix will be taken.
Oddly enough, it's been 17 days taking Endothil 1/2 hour before our workout and we have kept the same diets, which have no refined sugars, with meats, protein drinks, veggies, fruits, and lots of water. Our workout is the same exercises we have been doing for well over a year the only variance is we have dropped the weight so we can increase the reps by 3 per set and push hard on the last of our 5 sets. We are also working out one muscle group rather than groups of two.
During this time, we have noticed some definition gains and have gained some weight. I, personally, have gained 8 pounds during this period. My friend has gained 5 pounds.
I keep this updated as it's still early in the game.