I have taken it before bro. I started it in February of '02, and ran it until December. I really liked it, but only because I could afford it at the time. Being that I couldn't now though, I doubt I'd enjoy it as much. You will need at least 12 weeks of therapy to get anything out of it. I really didn't start to notice any muscular-effects until around that time, and at around $400/kit(avg.) it can get pricey. I liked the ancillary cosmetic-benefits it gave me, other than the muscle gain though. I did take it with insulin, but it didnt add much. I'm no fan of slin though to start. It makes me fat, and hypoglycemic. No benefits at all. Bottom line for me is: if you can afford it, then go for it. I'll probably use it again when the skin in my face starts to sag when I get older. Hopefully then, Serokits via pharmacy won't run a friggin grand per kit! Other than that, it is only really going to benefit you(assuming you can't afford it) if you are a heavyweight competitive BB'er, in which case you will need it to compete.
Some drawbacks, and why I quit:
2. GH Gut--No remedy
3. Carpel-tunnel Syndrome--Had it REAL REAL bad, and the reason I quit for good.