I have the Edge and Ridge. The Edge is designed more for guys since the way it curves should make it so it is stimulating the prostate, but it also vibrates right on the taint/back of your balls. The Ridge is for either sex and goes deeper and is wider at the last ball. The big thing with the Ridge is that the tip of the shaft rotates (you can change the speed). You can also sit on the Edge, you can't with the Ridge since the base is a bit big. I'e been meaning to get a Hush but just have been lazy.....