To be fair I gave a 3 star durability rating as how did I know as I just bought this item?! Anyway, I bought this big hole saw because I bought some spotlight pinholes and needed to cut big holes in the patio rafters and curbs where the old lights were, but they had smaller bases for each light. The saw deserves a full 5 stars although I struggled a bit with it. Some holes had to be drilled in pieces of wood that weren't quite solid and only a half or 3/4 hole was needed as the electrical connection was already partially exposed. Where there were many holes, the saw worked very easily and sawed wood quickly. The half holes were difficult because I didn't have a pilot hole to stabilize. Very difficult but I managed it mainly because the saw was great and I was persistent. He handled the 3/4 cut almost as easily as the full cut with minimal effort. Overall it's a very good device and I've made it work harder with a few odd cuts, but it worked quickly and efficiently.