I've taken it and I must say it is very good. Especially when we have a friend over.....
It takes away all concerns of achieving and maintaining an erection, OK I know but I am 52 years young, which is useful. It also increases the amount of blood flowing which increases size and pleasure and it seems to give me more control. I think this is a mentla thing though, but I can usually go for 2 hours or more.
Also some of the male models take it, it just makes their job easier.