I've bought an X-Car, pulled it apart, compared every component to that of an Xerun of the same value, if it's a copy it's a b.... good one, they look to use the same OEM components to me but I may be wrong. The X-Car case is slightly weaker and they use a cheap sensor cable, and there is no fancy packaging but my Son has an X-Car 60A in his XB4, I've put the latest Xerun firmware on it, he uses the same program card / software as the Xerun in my SC10 and it behaves identically.

Some people have a permanent grudge against Hobbyking items, so best to take all opinions with a grain of salt