Got my box rotor in yesterday. Charged the Lithium Ion battery over night and just installed the new bolt and RF board. I have to say, dumping 300 rounds full auto at my fence with the box rotor was a blast; one of the more unique paintball shooting experiences. Except for the stupid (obviously last minute) way to charge the battery (hint: you shouldn't have to even take it out) - it is glorious.
Hustle Paintball did a great review I watched before I purchased: https://www.youtube.com/watch?v=jfUaha53hxI