So after doing two fairly large stumps I would say roughly 24 inches round each here are my thoughts. Overall I am very pleased with the unit if I were in the stump removal business this is not something I would use but for me with several acres and an occasional stump here and there it's perfect. A couple of suggestions strongly suggest installing a backup camera your neck will thank you. Second I had a mid mount mower on my machine and the next time I will probably remove it to use the stump grinder I left it on the first stump I did and on the second one I pinned it in the up position which was a big help the biggest problem with the mower deck was the two stumps I did we're on a slope and it seemed to interfere with the movement of the machine when I had to lower the grinder into the stump. Other than that well worth the money