I decided to try out this cage after my first metal cage proved to be fun, but a little too small to really be put to serious use. Fortunately this design solves that. The multiple base rings makes it easy to find the right size, secure but not cutting off circulation even when aroused. Speaking of, the cage itself is a bit longer than other designs I've tried, enough room to get somewhat erect but still tight enough to punish this behavior, making it ideal for play with a partner. Once locked in place it doesn't go anywhere, it's a secure fit that doesn't allow any relief without the key. I did have a small pinching issues wearing it too long, but there's easy ways to correct it, especially for how affordable this option is. Overall I'm happy to recommend it, good for those curious about metal chastity but don't want to risk something that won't fit.