RBIS used my bike when he made the prototype. took most of the day to do with trips to the machine shop that made the production pieces. I rode home with the prototype on my bike and it worked fine. Just not near as pretty as the production piece he mailed me later when it was done.
I have hung any number of things on the mount, GPS, camera, cell phone... the location seems about perfect for visibility. Have had no problems with durability to date and it has been on there for about three years now and still looks great.
Willing to bet if enough folks expressed an interest he would make an other batch of them.