For me, you can drive your 800 very very hard. I drive mine HARD all the time. The pedal to the floor. I jump, slide, rock climb, top speed all the Time . I have never broke anything in 3500 km.
I have the race kit (wet clutch delete, two brothers exhaust, Power Commander 5 with autotune)
When i have receive my ZForce, i have retight every Bolt and put grease everywhere. I think that is the only Real trouble with this machine, the bad preparation. After that its rock solid, a lot more than the RZR of my brother.