Product Rating: 4 Stars - Extremely effective! | Power Rating: Mild - Enjoyable but not orgasm inducing. | Material & Construction: The Smartball is, as all Fun Factory toys, high grade silicone. Not a complaint about it. It's easy to clean, easy to sanitize, just plain easy. It's a well made toy, which is redundant to say after you say "Fun Factory". | Review: This is, like all Fun Factory toys, very well made. The little details really help: the curved notch they added for your finger to rest in while inserting is very helpful, especially with slick fingers. It's got quite a bit less rattle thank the duo Smartballs, but it's definitely noticeable. The primary good thing for me was the size. The duo balls were just a bit awkward in length, limiting the length of time they could be used and the movements you could make. This one is small enough that it's not even a concern, and large enough to be easily noticeable. The only problem I have with it is the loop to pop it out with. It's just a string of silicone, which means it's got quite a bit of stretch to it. I was worried about the possibility of breaking it, honestly. A loop of plastic or string coated in silicone would probably work better, in my opinion. All in all, well worth the money and exceptional fun. Fun Factory never fails to satisfy!