I have used this tool very day and has not let me down. other cutters plug and will need a screw driver to remove it. That type can also cut you when cleaning out the "plug". This tool works fast and seems to stay very sharp. I store it in a empty prescription plastic bottle with the cap and keeps it nice. Does not skip to start and cuts a clean hole in metal or plastic boxes nicely. Must have to run conduit in boxes for the smaller holes. Of coarse you will need a knock out tool for larger holes (Like 1 1/2" inches or larger) but this tool works very well for smaller.