I'm sure there will all kinds of opinions on the brands, I bought the Progressive Industries, hardwired50 amp EMS-HW50C. I paid $339.98 plus $12 shipping from Dyers RV. I like the remote display, where I can see what is going on, with the voltage, amperage & the hertz. I had the portable 50 amp EMS-PT50C, & sold it to my neighbor, so I could have the remote display inside our RV. Somebody may sell it cheaper, but we had bought other products from Dyer & it all included on the shipping. Here is that link:
http://www.dyersonline.com/progressive-industries-50-amp-permanent-electrical-management-system-with-remote-display.html-hthttp://www.dyersonline.com/progressive-industries-50-amp-permanent-electrical-management-system-with-remote-display.htmltp://www.dyersonline.com/progressive-industries-50-amp-permanent-electrical-management-system-with-remote-display.htmlHW50CEMS-HW50C