I needed a certain size to cut a hole in several inches of plywood. It worked, although getting the plug out of the drill was a bit difficult. (I had to disassemble and remove it from the back.) I also cut a clean piece through the radiator shroud. The plastic case broke right out of the box, so don't plan on that. Overall I think it does a decent job for limited use. If you're looking for something you can use over and over again, I suspect it won't last long. Considering the price, it…
Mandrel and saw are slightly uneven which means they will not cut perfect holes. To an extent, I solved this problem by clamping a piece of wood under the piece I was drilling, which generally held the drill bit in place fairly well and produced an acceptable hole. Not a bad set for the price, but not great either. It cuts holes easier than by hand. it was what i needed. It should also work reasonably well in a drill if you happen to have one of those horns laying around. Be warned though…
Not bad for the price. As everyone has said, it's oily and in a cheap crappy case - expect that. The Beats themselves are of decent quality. I went through 100 1/2" wide holes with a 1.75" saw before the mounting slot warped and the drill became unusable. I ran it constantly and really hard so it probably didn't help. The Bracket is a double edged sword obviously this would prevent the drill from warping like me but then you wouldn't be able to use the holes it occupies to knock out the circles