We have the largest one they make. The 30 pro xl. Its rated at 5.25" capacity. We keep it tied down in our small landscape trailer for pruning jobs and clearing saplings and such Chips fast and it's cheaper to run and maintain than our hydro feed. Havent had any issues with it. Ive even used it for small removals on occasion. It produces smaller chips that are really nice for landscaping. Whenever we use it we save the chips to use at our houses. I think the smaller ones they make would be underpowered and useless for any real tree work. Probably would be ok for the average property owner though.