We have sold hundreds of these with really no problems that I'm aware of. We sell all kinds of winches, Engo, Mean Mother, Warn, Viper and others... and the fail rate on all of them is so low it's hard to measure. It's usually in the contactor/solenoid box from water getting in there.
Personally, I like Mean Mother's approach.. since they and most others now, use sealed one piece solenoids it's best to just let the water in and out.. .MM has large holes in the bottom of their box, this way you don't have worry about everything corroding from water just sitting in there when the seals fail to keep water out...which most do not.