I have had my tractor for about 10 years and only put about 15 hours a year on it. I keep it in a garage out of the elements and have had it serviced by the dealer at 75 and then again at 150 hours.
My major complaint is that the shifter for the front wheel drive keeps disengaging while running and I am constantly pushing it back down into position.
I also had a number of the wires in the engine compartment (for the head lights and the temperature gauge) fray and disintegrate due to vibration and rubbing on the radiator hose.
Another problem is that the pre-heat coil light stays lit after the engine is started and the key is in only the run mode.
All this with less then 200 hours on it and very light yard use.