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I installed the hard wired version of the Progressive Industries 50A model with remote display a couple of weekends ago. We bought the T.H. last October and have not used it yet, but it will be protected when it is taken out. I installed a 50A shore power hook up at my house, and have used that quite a bit over the winter, but shortly it will go out for the first time in a "public" hook up. In my opinion, an EMS is one of the most needed add ons that you can buy...for protection of your investment.