I have a silicon sleeve/pocket pussy, nothing fancy or expensive(My ex-wife actually bought it for me). I love it. I think the opening may be tighter than most. I can only get it on my cock if I am really hard. It feels amazing all lubed up with lotion. That would be my only complaint is that it is that hard to get into it. Hence, I usually only pull it out when I am rock hard and usually pretty horned up and then cant last too long in it :-) It does make me cum hard. And it can be messy with the lotion, so its tough to use it while beating at the computer. It cleans real easy and quick with warm water.