I have not tried incarnate but Levi RL is pretty sweet. The effects seemed to "wear off" after about 3 weeks but that's probably tolerance issues.
As far as IGF-2 goes, it's amazing imo. I had been dieting for two months and my strength had severly plateaued. After like five days on it, I was hitting PR's. Since I weigh about 240, I took four caps three times a day.