I have a Warn winch, and I have a friend that has the Mile Marker winch. The Mile Marker does not have replaceable parts, or solenoid. The line speed is slower, but that is not always a bad thing. My friend has the 12,000 lb. MM, and it has lasted him for several years.
Usually when you are using the winch, you will be in the drivers seat..........just put your foot on the gas pedal and raise the rpm's up a little bit. I have also seen people install an idler switch on their dash. It will lock in your throttle at 1,000 rpm's or so.