While it's a basic design, Alumina Flow is still pleasing. Well, the big end is. The larger end of the toy has just the right size increase to provide a great sensation when thrusting with it. The smaller end, on the other hand, is just too tiny for me. I just can't get it to do anything other than make me frustrated. If it were a one ended toy, this would be a four or five star product. It's not, and the little end brings it down.