i, never driven the "2.0 buggy" but i did drive the '1.0 eight buggy' with the roller chassis on it and its not the easyiest thing to drive at least on a rough track it seems even with tuning it .
now i never tried it with the flex chassis so maybe you can drive it harder.
but when i driven it on a smoother offroad track there not rear end fishtaily.
acutally heavyer buggys you can drive that pretty hard and not so finess.
everybody has diffrent driving styles to meet thier match.