Ditto on the Wallenstein. I have the BX-42 on a BX2200. Absolutely no need for mechanical feed. At times it is almost pulling branches in too quickly. You don't want to be hanging on to them. Good machine. Solid. Blades still fine after running for two years but I guess that depends on how much you are chipping and how dirty your wood is. Direct drive simplicity is best, no belts or things to worry about. Heavy rotor is good for BX2200 since it is on the lower end of recommended power.