P.W.
My husband has used men's Rogaine, and it has definitely helped him keep his hair. It's wispy and thin, but I'm pretty sure he would be completely bald by now without it.
Women's Rogaine is not significantly different. It does help, but it probably won't give you luscious locks. And you have to keep using it. It is a little messy, and leaves kind of a film on his hair. I don't know if the female version does this. It's a bit of a pain, but better than being bald, I guess.