As a contractor I have installed many new LED lights. Without such a device, you create a huge amount of dust and debris that needs to be cleaned, but with this thing, all the debris and dust is collected in the cup, and the cleaning is very small. I will tell you two things; The first is the fact that the inside gets dusty and it's hard to tell where you want to drill the hole, so you have to drag the edge down to see where the starting point is. Second, you want to make sure you apply…