I have one I bought a couple months ago. It comes with Green Manufacturing 900 series Wearsharp Green teeth and Green Manufacturing is local for me and I can buy them direct and have the reground there in their machine shop as well so that was a win-win for me. They have a learning curve like all stump grinder do and really should be mounted on a hydrostat tractor which I don't own so the learning curve was a bit steeper but they are a very well built unit and easy to service and usual Land Pride, loaded with grease fittings. I might add that the input rating for the one I bought is 50 horse but I'm running it on a 95 horse Kubota so I reset the standard slip clutch a bit lighter than the spec so I don't destroy any parts, not that it's not under warranty because it is.
