I purchased an RTV900 in 2010 with about 3000 hours on it and have since added another 210. It has a plastic roof over the cab, a dump bed, and 1 7/8" trailer hitch (since changed to 2"). I had to fix a leaking coolant fitting in the head, replace the front drive shaft, replace the rear u (CV?) joints, and tires. The previous owner had beefed up the bed with tread plate and angle iron, then slapped a coat of gray primer over the whole mess, so it's no beauty queen but it works hard. I've had almost a yard of gravel in the bed many times, so much I had to give the hydraulics a little lift by hand to get it moving. As others have mentioned, it's no speed demon, but it'll climb any hill where there's enough traction. I think that the Carlisle AT489 ATV tires I put on it are better for traction, but the Kubota tires are rated for higher loads and are probably tougher around rocks and field debris. Kubota doesn't sell replacement tires, only complete wheels. That's probably because it can be very difficult to get the beads to seat. I had my local tire guy order the tires and his men spent several hours trying to seat those beads. Shifting is only a problem when the drive train is loaded, such as when stopped on a hill. On level ground with the brakes on it shifts easily, but can seem to get stuck in gear if it has just been climbing/descending. Only cure I've found is either to plan shifts in advance for level ground or failing that, to somehow unload the drive train, usually by going down hill and applying the brake to stop. But that can be a problem if you're headed up hill and need a lower gear to make progress, especially since the shift lever won't even move into neutral. In situations like that blipping the throttle sometimes helps, as does rocking the steering wheel. With enough persuasion on the shift lever I've always managed to get it to where I want it. I do the oil/filter changes regularly, and other than the u-joint issues, the only other problem I've had is a stick that holed the radiator. A local shop was able to braze the hole and it's been fine ever since. Other than that I've had no other problems with it. One modification I've been considering is moving the air intake over to use the roll cage, as the stock air intake is right in front of the rear wheel and really sucks up the dust. The only real shortfall I'd complain about is a lack of power. The driveway here climbs a 300 foot hill to get to the mail box a quarter mile away, and speed drops by at least half in the steepest part of that climb. That's just the hydrostatic transmission doing what it's supposed to, but the one time I tried to keep up with a friend on an ATV I was literally left in the dust at the first hill. If I had it to do over again I'd also look at the John Deere Gators, but since I've yet to even sit in one, I can't comment if they're better or worse than the RTVs.