I have about 50 switches, all Gargraves with Z1000 motors. No issues. I do have the motors so placed & wired that, if there is a motor failure, I can pop in a new motor in a few minutes. I have a few spares handy.
Only problem with the motors is that occasionally a gear on the internal motor shaft kicks loose, which is a simple repair, after which the switch motor is ready for re-use.