I haven’t had any problems with the grinder, just uncrated, greased and it went right to work. I was able to run for 6 hours the first day without fatigue. Very good visibility, easy to maneuver around and line up with stump. I have only been able to grind up 20 stumps as it has been real wet here. I was able to grind up 2- 40’’ stumps with the roots and push the shavings back in to the hole and level for easy mowing. The grinder cuts through smaller 10’’ to 16’’ stumps in just a few minutes. The larger stumps take more time, but that has more to do with the 15 gpm flow of my loader (John Deere 319E). Also with larger stumps you have to work around a little, as you can’t reach opposite side to pull the cutter through the stump. The cutting teeth are holding up good, still feel sharp and cut like new. All in all very pleased with the grinder, it is a lot better than the walk behind models I have rented in the past. Thanks for the excellent customer service and fast shipping.