I guess my biggest concern with LiPo (as available at this moment) is that hard cases are unavailable. I wouldn't worry so much outdoors, but indoors on our club's VERY expensive to replace carpet I'm concerned about well-intentioned experiments going wrong. Beyond the fire potential, does anyone know what the "juice" from one of these batteries would do to Ozite? There are a TON of things in a 1/12 chassis that can poke through a soft lipo in a hard wreck.
All that said, I am VERY interested in the results you are seeing.