This is a simple thing.
There's a simple way of avoiding trouble with the Xcelorin, and it's mostly down to not assuming you know how the world works
Step one, use the USB link and software, download the latest firmware from Losi and upload that on your ESC.
Calibrate your ESC to your radio.
Now open up the Losi Software and set up what settings you want in the car(lipo cutoff, drag brake etc).
Start with a mild gearing for your track, and gear it not after temperature, but by feel and sound. The motor should just about empty itself in the end of the straight.
Now that you have the right setup, and a mild gearing, you can start to get to know this system, and what gearing you need to run.
The Xcelorin system is brilliant for people who know what they're doing. I work for the Norwegian Horizon distributor, and I don't sell Xcelorin to any other than raceexperienced guys, not bashers. Bashers will never bother having the right gearing, firmware or setup, and that could kill it.
But In both of my competition buggies and my friends cars, BULLETPROOF!