Worked great on pine. As soon as I used it on oak it broke. Maybe I filmed too much. I cut about 1/16th the groove depth at 24,000 rpm so it could have been user error or poor quality. I do not know. Follow the news. I ordered a different racket, a different brand. It worked perfectly. But I think the big problem was that I was trying to drive too fast and shoot too much at once. In the second set I only drove 10,000 rpm instead of 24,000 and made very flat passes. About 1/32 each time. I'm giving 3 stars because I don't know exactly why it broke, but it could have been operator error.