The Xerun felt more like the Tacon then the Castle, as far as the spool up control, it just hit harder then the Tacon. The Xerun was really the power house of the bunch. It would wheelie faster, and was more prone to spin the tires uncontrollably. I want to say I could really feel the higher kv of it, where the kv of the other motors felt more similar, if that makes sense. I just don't know how much running the higher speed played into that, but they are also so close, that I'm not sure I could hit a perfect gearing to match their speeds.