Had one of them, great tractor and easy to work on.
If you live in a cold climate I suggest you get thinner oil for winter, a trickle charger and battery warmer plugged into one plug so that it's easy to start. No problems starting in temperatures as low as -15Celsius. Mine didn't even have a grid heater. The heating is close to nil due to it being air cooled.
The owners manual is only available in the aftermarket and I found it to be somewhat useless.
The AC compressor is off a semi so if ever you need to fix that, you could salvage parts there.
Mine was a 4x4 with locking diff, cab, ac. Got it with around 9k hours and Sold it with 10k hours on it (upgraded to a newer tractor).
Not sure if it's true or not, but I heard that you should run with the pto running when ever possible (if nothing is hooked up to it for instance) as it saves the clutch or circulates oil better.