Just got back from the first test runs, ran through 2 sets of packs. All I can say is I'm VERY impressed.
Geared for 40mph and running on short, dead grass the lipos got to about 100F, Mamba Monster fan only came on a few times very briefly, and the CC/Neu 2200kv didn't even break a sweat running no higher than 110F.
The Slipperential worked awesome too, it's especially helpful for someone like me who is still learning smooth throttle control. I'd hazard to say it's the best RC upgrade I've ever bought.
Really looking forward to getting some track time and dialing it in on the dirt. Thanks to all the people who've answered my questions and helped me get this baby going!