I run 2S 4000's in both my B44 and my XXXT CR truck (saddle and stick) and both perform phenominally. I charge and balance mine every time on a Hyperion charger and have never had an issue. Customer service is #1. I have spoke at great length with Jason on the phone and they even offer LIVE online support.
I have dealt with Maxamps for the past 3 years and will continue to give them my business. When you find something that works...stick with it.
