Hi Michael,
I wouldn't worry too much, these things can always be repaired !
I've had problems with the DC brushed motor on my Chinese clone Optimum mill from new and repaired it at least a dozen times. The electronics only failed once and that was a 20p 5 volt regulator IC where one of the leads corroded through.
I finally sorted the motor by replacing it with a somewhat bigger treadmill one, still using the original controller !