First, I didn’t realize that it came with 2 different sizes when I ordered it, so that was a pleasant surprise. Second, I am currently in a long distance relationship so have only used these on other toys and not with a human, but I have no doubt these would great used that way too. My partner is girthy and I’m using these to size up my “average” sized toys in preparation for an upcoming visit. The vibrations are nice, I do like the light on it as well. I will say that I’m not too sure a partner would like them or not. When I go hard, the tip of the toy changes the mode that it’s on, which I don’t mind, I just think it might be too hard for a human to handle in that spot. The material isn’t sticky, there was no odor at all. I like the cylinder foam sticks in them to keep the shape of the extenders when not in use. They are super easy to wash. Lots of stretch, easy to put on my “bigger” toys (7.5” long and 2.75” circumference). They actually made one toy that was too rigid more comfortable to use. I like how they add just enough girth to feel “full” without feeling like I’m being stretched, if that makes sense. I highly recommend this item for anyone that wants to experiment with bigger sizes and to experienced players.