I was amazed at how accurately I could cut with this tool. I was replacing a recessed porch light and although I knew from the dimensions that I would have to enlarge the hole, I decided to purchase one along with this tool. Turned out to be a smart move. I was able to cut the aluminum trim on my porch ceiling and install a new bracket in about 15 minutes. It was a difficult application and I was concerned that the tool would be able to cut the minimum amount of material such that the new cut would not be visible at the edge of the jig. I didn't have to worry. This tool made an amazingly detailed cut with very little effort. And no experience on my part. I doubt I will need to buy again but will remember this company for future purchases of other products. This is a well made, high quality tool.