I see lots of these Albright knock off things on Ebay with prices all over the map. Besides the famous Albright unit, are there other manufacturers that people have used long term with good results? If so, please post up and the cost. I know that my M10,000 winch have fulled excess of 600 amps under full load so hopefully a typical 500a unit can handle a short current spike of this magnitude. Thanks for your input.