I don't have an electric winch, but I am planning on one in the future. I have a J-Rations magazine with an article reprinted from MoabJeeper magazine. The guys did torture tests on the following winches: Bulldog, Superwinch EPi9.0, Chicago Electric, T-Max, Ramsey, Mile Marker, and Warn 9.5xp. Only three winches survived the tests: Superwinch, Chicago Electric, and Warn. The Warn was the best of the bunch, with the fastest line speed and longest duty cycle. The Chicago Electric was very slow and near death at the end of the tests. The Superwinch was almost as good as the Warn for a lot less money. The problem with tests like these is you don't know who's the big sponsor, or how controlled the experiments really were.
I think most folks will agree that Warn is the best in the business. Warn has a lifetime warranty on mechanical parts and one year on electrical. I'm going to take a look at the Superwinch before I decide (one year electrical and mechanical). Most of the Chinese winches (not wenches) have a 90 day warranty. Like most things, it seems that you get what you pay for...