The main wear item in these accounts is the motor. Some owners say their RadRover 6 or 6 Plus needs a new one. They respond by looking for original parts, including one owner checking whether a parts website is legitimate, and one owner is setting money aside to buy available parts. Others would rather not move to a third-party motor, since that would mean replacing the rest of the electronics.
The long-term accounts are thin. Parts availability is the only theme with enough owners to report, and it rests on a few comments. We cannot say how the battery, brakes, frame or other parts hold up, or how common motor failure is. Treat this as a few owners' experience, not a pattern.