Hi Mike!
I looked at the Go Power and Zamp portable systems along with the Renogy. Go Power and Zamp both receive very positive reviews on Amazon. Being so new to solar I choose Renogy strictly on price. I figured if I cooked the controller or it didn't function as advertised it would be easier to take the cheapest hit of the three. Now that I have used portable solar for a couple of years I wouldn't hesitate to purchase any of the three products. To date, I am very happy with the performance and reliability of the Renogy system. Just a side note on performance... my Dad and I usually boondock together and his rig has roof mounted solar system. My portable system always outperforms his system due to my system having the ability to be moved with the path of the sun. Good luck - Happy Trails!
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