Both escs are great, I like the FX-R because of it size I have one in my scaler. I am a Castle guy by heart and the sidewinder is a great esc as well. The crawler kit you asked about is a Berg and it has great axles the rest of the kit is ok, but any kit is like that. I run Berg axles on my 2.2 comp rig and I can say that the axles are tuff as hell. I have not broke anything yet and I have been running my axles hard for about 8 months. As for a motors Holmes Hobbies has the best hand wound brushed motors on the market. IMO