I have 4310/420 with the power-reverser and I have been overall satisfied with the tractor. The loader has respectable lift for the size of the tractor. The Yanmar engine is great. Easy starting and maintenance free at least for me. My biggest dislike is the over engineered circuitry for the powertrain system. The previous series utilized mostly mechanical linkage for the hydro. The "10" series went electronic with solenoids and such to make most the of the valves open electronically. If the resistance tolerances get out of sync it will start throwing codes and not move. I have been happy with the tractor and had it for 7 years and have had no buyers remorse or intent on replacing it.