You can run ANY sensored motor with a Slyder so your not that limited. I don't like sensorless stuff myself. Sensored stuff lets you run slower motors too if you need or want to slowest motor Castle makes is like a 4600kv which is about a 8.5-10.5 I think. I run all Novak stuff. I don't mind Castle but I run 13.5 and 17.5 stuff and you can't with Castle. You can program Castle to run slower but if you race it most likley won't be legal.