Ampflow

[overkill]

I have used the Ampflow A28-150 since 2008 (including at Robogames). The main problem I have had is that large spinner impacts can cause the ends of the brushes to flake. This leaves a very thin end on the brush, which generates extra heat, wears down faster and covers the insides of the motor in graphite. I'm using the motor to power a spinner, so the motor is getting a much harder time than if it was a drive motor - you would get less wear than me. The thing to do is regularly check one brush in each motor and it it is chipped, look at either replacement or filing the ends flat on all four brushes. The motors are easy to service and I have rebuilt them over & over.

Update: I agree with Jarvis: two Vypers are cheaper and have more current capability than the ampflow ESC. They are also smaller and lighter and very well constructed. Since the A28 motors have two independent windings, its easy to use two ESCs on them.