I've been using the Low-Carb Grow! for a few months now, and I feel like it's contributed quite a bit to my overall muscle growth. My diet has remained pretty much the same before and after starting on it, as have my workout routines. And I've added about 50 pounds to my bench, with proportionate increases in other exercises. I also see more definition, and my muscles feel harder.
I've been taking Spike, as well, which also seems to give my workouts a boost.
Before I get anyone too excited, I'm 37 y.o. and my max bench is only 225 now, but that's a big increase from where I was before.
I just got my first cannister of Surge, which I'm going to take after today's workout. Sounds like it tastes pretty gnarly. Oh well. I figure, if I've chugged tequila, I can probably handle Surge. lol