I spoke with my doc that monitors my "stuff". Asked him about it regarding women. Same as Sas says, but one negative in my opinion. If you don't have really good will power and a clean diet, it will hurt your dieting in the long run. You are able to cheat much more while on, so many people just eat worse when they see how it works. Then when off, you have to re-train yourself not to cheat to stay ripped. I can cheat 2-3 times a week and stay as lean as when I'm off and only cheat once a week. Not a cheap way to stay lean! There are some extra healing effects that are nice, thats what I use it for.
Also very important to watch your blood sugar and stay away from high gi foods. If you don't, you can screw yourself up. I have some ex-bb friends that are now Type II from iresponsible use!
Just my .02