Cuts cement siding like butter. However, it consumes a lot of air. So if you want to cut sheet metal siding, you need an air compressor with at least 4 CFM. My 2cfm compressor is great for cutting 8" boards. I still have a problem with broken corners at the end of a cut. It doesn't happen all the time so I'm sure it's my technique. Someday I'll find out. Great tool! Fast and precise, eliminates dust when cutting with an electric saw.