id go for a revo cheaper to get the 2.5r now the 3.3 is out and the 2.5 is the more reliable engine had mine for about 2 and bit years never had any big breakages usual bits go e.g plastic tie rod ends, one arm after landing on a fence pole which was replaced with rpm parts.
parts are cheap for them and easy to find good customer support from traxxas plus its one of the best handling monster trucks on the market which can still take the rough stuff