It's fairly useless. Even going offroad, the Infiniti FX Concept and Range Stormer more than surpass the thing. Only worth getting for the K2RED paint chip as far as I'm concerned.
You'd be surprised what the MX-C can do. If you set it up right, it pretty much doesn't care about its weight and just eggs you to go faster, like a Lan Evo or Subaru would.