One of the great benefits using the E-Z Log Tenon Cutters is that it produces a perfect tenon. That is because of the pilot hole that is drilled at the end of the log first which guides the cutter.

Unlike the pencil-sharpener type tenon cutters, you have to hold your drill pretty straight on your own, otherwise you will end up with gouged tenons. How do I know this? I have several of those type of cutters which I used before the E-Z Log Tenon Cutters were available.