Look out for excess pressure in the header tank! (See my overheating post). There should be some pressure in there after a run but it shouldn't gush everywhere.
Other than that I've been well impressed with mine, only had it a month and haven't had the chance for any serious off-roading (see above) but it coped admirably across steep wet fields to the orchard I occasionally 'work' in. And comfy on a run, when the heater works and it the engine doesn't overheat!
Not too bad to work on and loads of advice here (and elsewhere) on performing any bit of maintenance you ever consider, and many you, quite frankly, shouldn't!