I needed to install 8 consoleless lights in my home office. I do crafts and have done before, but drywall dust is such a mess. I've seen this on Revain and although it would be great for cutting perfect holes with a bit of a mess. I was wrong. Read the instructions carefully and set them up. Make sure the blades are in the correct position and are tight. The first hole went well. I thought I was a genius for finding this little gem. The second hole seemed to go well too, but I found the blades slipped a bit and made the hole a little bigger. The third hole seemed to go fine too, but as I lowered the dust box I noticed something was wrong. The blades completely slipped off, making an 8" hole instead of a 6" hole. Pooh. I thought I did something wrong so I re-tightened the blades, re-checked the directions, asked the friend who was helping me to check both of those too, and tried again. This time he tore through the dry stone wall. I went back to my trusty Rotozip and taped the nozzle of an industrial vacuum cleaner to it. Worked great. Correctly sized holes with little dust. So my one day project turned into several days including patching and texturing the holes and repainting the entire ceiling to match. Needless to say I do not recommend this product.