It's been only a couple of weeks since release, but I was taken by the design of this as well as the thought that most likely went into it by designers of a reasonably successful silicone design. http://www.bon4.com/bon4m-metal-chastity-belt/ Has no-one here bought one? I thought for sure someone would have reviewed it by now, but not a word!
I wear the BON4Msmall regularly and find it's the best device I have owned for long term wear. The only downsides I have seen are the hinged ring (but that hasn't been a big issue for me) and the sharp edges on the ring and cage that I had to finish by filing and sanding over a week or so. Otherwise, it's the best investment I have ever made in a chastity device.