I am only on my third run with this thing but I really like it so far. I jumped to a 15/60 gearing and it acted like my mamba setup. Accelerated faster, better top end speed, ran cooler, and ran just as long. I only have one concern. I am waiting for my Lipos to get here and I wanted to see how the voltage cutoff would work. I hooked up a 4 cell Nimh pack, and set the cutoff to 3.4/cell. It seemed to run ok on the carpet in my house. Shouldnt it have not run?