Ksisler- The tube notchers have been discussed on line many times before. The general view is that they don't support the thin wall tubes well, have a flexibility that creates angle distortion and the slop in the hole saw shaft fit makes catching a tooth real easy. Some notchers have more or less of these characteristics. The basic steel Joint Jigger I have (and given up on) took more time to set up and cut the tube then doing a miter by hand, but still the result needed hand touch up. Andy.