Well my X-maxx turned up yesterday and after some soldering converting batteries/esc to EC5 connectors went out for a quick run.
Running totally stock out of the box with the Zippy 4S's.
Gotta say I'm really impressed, more so than I thought I would be. Feels really fast even without the 46t spur!
Handles excellent for a big truck and feels very balanced for jumps, feels like she was made for big air.