Hill climb would be best with not more than 3 people total on board. not that it cant pull it, but i dont enjoy the sluggishness then. And its a low geared vehicle, so what i have noticed is that rather than pulling 3rd gear till 70-80 uphill, if you shift to 4th at around 65, it pulls better!
Highway is fine, the newer one will be more planted and stable. Braking will be sufficient to say, though since the wheels are the size of the M800, if you dont brake properly, they will lock up soon.
Steering is the best bit, ultra responsive... Just point and accelerate, no worries...