There is an australian seller on ebay who moves quite a lot of these things. He's actually done some really good work in modifying a lot of the parts which apparently cause problems (clutch, gearbox). He offers you the choice to order these improved replacements with the buggy or at a later date.
But yeah... i'd sell it ASAP. RC really is a brand name game. Having said this, ive found my XTM to be very durable with fantastic parts support - certainly not what i expected when i got it cheap on ebay.
If you're not too concerned about the $$$ then yeah - try and improve/modify the thing yourself, might get a nifty little basher out of it?