RE: Traxxas Summit
If you go brushless, do it right and put a sensored setup in it.
Otherwise, you're going to kill what makes this truck great.
The best part of this truck is it's low speed abilities.
Put a BL setup in it and you'll have to be very careful about locking the diffs.
The Summit is one of the few trucks left that really benefits from keeping a brushed setup in it.
Plus, you no longer have a waterproof truck if you go brushless. Something else to consider, depending on how you use it.