I have the 2200 castle neu and the MMM ESC in mine. On 4s it dominates the open short coarse class. A member here sells adapters to mount losi 8 shocks which help dramatically with the extra weight of a heavy motor and battery. Ditch the battery bar thing, dremel some slots and run battery straps for larger packs. The diffs are the same as the e-revo so your good there, look up kingheadz bearing adapter, you will need this after you melt the plastic one. You can use mod one gears, but the stock 32p is pretty good. As for durability I would grade it A+ since I have not broken anything since ownership except some bent stub axles and melting that little adapter on the spur shaft. My next ups are some new racing tires and wheels. Here is a picture of it with it's old motor the 2650, which was pretty good on 3s and sickly on 4s. Oh and on 6s this thing is kind of squirrely, but stupid fast.
