Yes I have, an RT-25. First, the contactor went out (4 months after purchasing it). Warn would not replace it under warranty and wanted to sell me a new one for $85. I got a new (other brand) contactor from somewhere else for half the price. Then, the motor seized up. Warn would not take care of that and wanted to sell me a motor for the price of an entire new winch.
My next door neighbor HAD a Warn winch. He never used it, and his ATV to this day only has about 300 miles on it. His winch literally fell apart. He replaced it with a Superwinch and lived happily ever after. I might note though, while my neighbor was installing his new Superwinch, he had all the Superwinch parts laying on his garage floor, ready to be installed. He had to go somewhere in the middle of the installation, and he accidentally ran over his contactor/relay (before he ever got it installed!). He called Superwinch the next day, expecting to pay for a new contactor since he destroyed the other one. But, to his surprise, the representative not only sent him a new contactor at NO charge, but he also sent it 'overnight' by FedEx!
When I installed one of my SuperwincheS, I found that a little bit longer cable would really help my installation. I called Superwinch (again, expecting to pay for a cable) and they sent longer cables out to me at NO charge.
Another guy, on this forum was having trouble mounting his new Superwinch Terra on his ATV. He called Superwinch for help. Superwinch sent him another model that would fit better in his atv, and they sent it at NO charge. Then, they ALSO sent him a rear winch mount for his atv so that he could mount his first winch on the back of his ATV, and that was sent at NO charge. So, the guy ended up with winches on the front and back of his atv and by only paying for his first ATV. The success stories with Superwinch go on and on.
Warn has a limited warranty. If you damage your winch equipment or it goes out of warranty, Warn is ready to dig DEEP into your pockets. If your Warn winch is a day out of warranty, that's your tough luck.
I do volunteer work for the U.S. Forest Service. Before the year 2000, they had Warn winches on all their trucks. Since 2000, they only purchase Superwinches.