Up front: my husband and I have only tried to use our Cockblock together once, and it was awkward trying to find the right rhythm. I think we will, though. In the meantime, he did cum while we were both inside it, and that was incredibly hot, so five stars just for that! Operations for two aside, I really like it for how easy it is to clean (I can't tell you how many toys I've bought that have parts that get gross that are incredibly difficult to reach to clean well), and also for the gentle texture on the inside. So many toys want to unceremoniously drag you kicking and screaming to ecstacy with their bumps and knobs and rough textures, and it feels good for a moment, but I always reach a point where it becomes a turnoff. I've used the Cockblock by myself a couple of times, and it's a slower build to orgasm, but once you get close, it feels nearly as good as the real thing (pro tip: if you're using it alone, go in through the back). The only negative I can think of is that the inner sleeve doesn't seem to conduct heat as well as some of the other toys I've used, so that even after I've been in it for a bit, it still feels a little cold. Seeing as it's made to have a second cock inside, providing warmth, I can't really knock it too much for that.