I bet you Hobbywing is in more RTR's than any other brand.
I wouldn't run it in anything 4wd I have both the old 2 pole and the new 4 pole Vxl3s systems and the motors overheat rather quickly, escs really need fans.
For Castle you have to either go Copperhead or Mamba X the Sidewinder 3/Sct/4...