The inventor of this hardware is also the owner of Rock Woodworks in West Palm Beach, FL. They specialize in high end, custom stairs for very wealthy and some famous people. With that said he would have to ensure top quality & safety to his customers as they are used to receiving 'only the best'.
If you look at what kind of work Rock does, check out his business website http://www.rockwoodworks.com and look at some of the photos~gorgeous!
Go get 'em Roger!