This is an old thread but I wanted to share a recent experience with my Powerplant. I bought it in 2009 and used the winch once to re-spool under some load. I've used the compressor a couple times per month airing up and found it similar in ability and speed to friends York/Kilby systems. I have (knock on wood) never needed the winch to get unstuck.
Doing some modifications last month I need to spool a little line out and then back in. As with so many others I was able to spool out but just got a solenoid click trying to spool in (compressor still worked). I called Warn tech support who offered to sell me a solenoid pack for retail price.
Reading this thread and others I thought the thermal sensor might be bad, a $250 savings over solenoid. I took the winch to Tri-County Gear in Pomona Ca, a Warn authorized repair center to have them diagnose the issue. They found that it was, in fact, the solenoid pack that was bad. They called Warn and haggled and got it covered under warranty.
I was a bit grouchy when I discovered the winch didn't work and even more so when Warn wanted me to pay full price for a part that was clearly not right when it was introduced, but in the end I have to hand it to both Tri-County who went to bat for me and Warn who really stepped up and stood behind their product. I have to add that Tri-County would not have tried so hard to cover a 5-year-old winch if the winch had not been very lightly used and still look nearly new. If yours has seen some abuse you might not get the same results. I don't know that I'd recommend a Powerplant to a friend because of the issues they've had, but I'd definitely buy Warn again.
Cheers