First, let me clarify that I am a carpenter. If you work with doors like me and deal with pocket doors and mortise locks on a regular basis, get this tool. If you're just doing this for yourself and need to install a lock, take a shovel, chisel, mark lines and hope you don't have to poke through the side of the door. For me it was a game changer. The time and effort savings are enormous. Once you get used to the setup, this is just the way to make mortise lock installation quick and easy. Watch the video and decide for yourself but it's a shame I didn't buy it years ago.