First let me say this. I am old and in poor health. I got the OS23 as a way to help me walk as I have difficulty walking. I sat it up by myself. We have cut a few trees on it mostly to start with were cherry. Now we cut whatever I can get. My son is building a barn. We cut 16 telephone poles into 12 foot long and 6 inches by 6 inches. Needless to say we have some good one inch bug proof lumber from them. Cuts everything we have to cut perfectly so far. Could only ask for cheaper blades and parts. But 16 foot maximum cut is going to be used shortly. Red oak, white oak, or hickory. It does a good job cutting. Just real slow on the dry hard wood. My mill when I get to fast cutting will try to jurk and vibrate so I slow down and my cuts are good.