Bought them alongside a different product from here that was perfectly satisfactory. However this one was a little disappointing personally. The base warps awkwardly when you try to squeeze from the sides to create suction which makes it more difficult to attach to skin, and when it does latch on this way the vacuum is very weak and falls off easily/does not noticeably stimulate the area during or after removal. Pushing down from the top where the ring is creates a better (yet still lackluster) experience but requires more precision and finger strength to work. I wouldn't say they're completely useless, but there are other toys that are both easier to use and more stimulating than these.