I bought this first but to cut plywood. Don't plan on using it for anything else because while it's not the most expensive I've ever bought, it's not the cheapest either and I want it to last a long time. It cuts plywood better than any other bit I have. Nice clean cut. The underside of the dado I cut out is smooth. There is no airflow on the top. I'm excited to see how much use I'll get from this before cutting gets boring.