Although I've been doing interior remodeling for going on 20 years, I've never really needed to mortise a door from both the edge and sides to install door hardware. I suppose most of my door work has been pretty conventional. My client ordered an expensive Emtek pocket door latch and I needed a mortice jig for the install. This one took a little time (and some practice on a 2x4) to get to understand the function, but it did the job well and the install was a complete success. I used a standard 1/2" Dewalt corded drill to power the cutting bit. My only criticism is that the cuts from multiple directions leave somewhat ragged corners. Easy to clean up with a small saw but somewhat irritating. Overall, I'm confident this tool will do the job whenever I may run across the need to mortise again.