yeah i did the on road thing with an electric car awhile ago. it's only fun for a day or 2, or if you are able to actually race on a nice flat laid out track. if you are able to actually race one on an actual track, it is kind of fun i guess.
but, to me...jumping and tearing up grass, and dirt is where the fun is...it isn't the same thing over and over like an on road car.
you will find that the stock volcano is plenty fast for off roading, but you will soon find yourself wanting to upgrade it for more power.
i'm at that stage right now. the direct drive will be my next upgrade.