Its worked like a charm every time I've used it. As for pre-maintenance I didn't do any before I put it in. I figured (and this could definitely be naïve) that its a Warn, they've been around long enough to have their shit together and a system that they claim needs no additional lubrication is just that. I guess time will tell.
The two maintenance things I do do to it are cleaning the synthetic line and I make sure to run it once a month to get the juices flowing.