Great video!
I'd like comment on some things mentioned about driving the Spear, and offer some pointers.
The tendency of the Spear to flip when cresting hills can be controlled by rapid throttle blipping - so using "R" (auto run) to drive on any uneven terrain is not a great idea, and on the really steep terrain where the Spear has no equal it is pretty useless. I am not complaining (it's my favorite) and I think it is correct that such an intense vehicle is a little hard to handle. When you get better at handling it the fun increases!
Cornering in the Spear requires a different technique. Lift off the throttle at turn-in so the Spear can rotate in a shorter distance, then hit the throttle again and the instant acceleration has you back a full speed.
And I just have to say, especially after driving on some tight, winding roads, that the drifting effect of the Spear is great, every turn requires some degree of oversteer correction. Driving the Spear is very engaging, it is not as passive an activity as many other vehicles. And yes, it does still flip a lot, often for no apparent reason - less of that would be good.
Miles