I just converted my XXL a couple of weeks ago and took it to a track a few days ago for a decent trial run, we got some footage so I thought I'd put it up. The trial uncovered that the 4mm perspex base I made for the battery and ESC was not strong enough, it broke across the full width bellow the battery. I was happy enough with the rest of the truck, no big issues to stop too much driving time. I was running the MMM 2200kv on the lowest settings with 4s Nano-tech lipo's and a tad loose slipper. I only had the throttle between 1/2-3/4 pull at anytime and was pleased with the temps, handeling and performance of the 7kg truck.
http://www.youtube.com/watch?v=4AiXaDGfozI
http://www.youtube.com/watch?v=_bay_Py-kLo
I have a few ideas for a rebuild but I'll be happy to hear other's too.