yeah, mag-10 is some pretty good stuff. i didn't gain but only 6-8 lbs on it with a slightly above maintanence calorie diet (not supposed to go that low on calories by recommendation). but on a caloric defecit diet, i maintained and possibly gained muscle, and lost a lot of fat. it is rather expensive, and you can probably make up a similarly effective stack for less with the supps nutriwrestler mentioned.