Tenon Cutters

I was thinking of building some log furniture and was wondering if anybody has any experince with these tenon cutters: http://www.traditionalwoodworker.com...p/cPath/36_462
They look nice and seem to be the best choice but they also expensive so any feed back and comments would be appreciated.

I watched a traditional woodworking demo at a fair last summer that had a user participation setup. They had one of those set up on a brace and bit and were using it on ash and hickory. Worked pretty well. I tried it and it was smooth, not too much effort to use.