[*]It is belt driven, and hasn't shown it can handle the same drive loads as a shaft/gear driven car.
No problems with mine.
[*]The whole chassis layout looks like a yard sale.
True, but some creative wiring can keep it fairly neat
[*]Dirt easily finds its way into the diff area, hastening wear.
Does it?
[*]Motor has little open space, so you can easily smoke a motor if you are running on low grass, for example. Temps get high around the motor, and it can cost you.
Holes in the shell over the motor help emmensly, and also opening up the back of the shell to allow air to move through
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