I bought the woodmax wm-8m. I've been really impressed with it. About 10hrs of chipping in and it's eaten everything I've thrown at it. I wud of liked to do the hydraulic feed but my tractor is a little under sized and I thought the mechanical was a little lighter and a lil less HP req. I'm running it off a Kubota B2920. It's a load on the 3pt right under max but the pto has no trouble running the flywheel. Had to shorten the drive shaft to the minimum and buy a longer top link for the 3pt but now I take it to the trees and chip branches where they lay.