superdrol is reportedly an awesome supplement for making strength, and to an extent mass gains. Very popular with the overseas markets....oddly enough, most people only use for a 4-6 week period.
It's also alleged to be very harsh on the liver, and most users also perform pct after using this supplement. I don't know if it's still available for sale in the US, but I've heard it's hard to obtain and may be out of production soon.
I've wondered about this one myself...let me know if you try it.