I have my first brushless install complete, here is a the final look The Mamba X is a little longer than the stock ESC, so it overhangs the edge of the receiver box. It seems to be mounted pretty securely. The lid is actually a little concave, so I used two layers of tape to ensure the entire bottom surface was taped where it could be. The servo feels quicker even on the 5.5V default BEC output. I have the Castle Creations Quick Connect wire in place so I can program things without having to leave the receiver box open...though the receiver box itself is quite packed and that might impact reception/range a little bit. A tip for soldering connectors on a battery: use a plastic spring loaded clamp on the exposed part of the wire you aren't working on. This will add some weight, and cover the terminal until you are ready to work on it and prevent short circuits.