I had one. In theory it's a great tool, but it's so cheaply made that when I tried to use it in a hard balsa trailing edge it died. It was still under warranty, I wrote Great Planes an email asking them for help and never heard back. It wasn't worth the time or hassle to keep asking for help so I chalked it up as a loss. By that time I was using Robart hinge points so I didn't really care.