I used the Renogy portable panel this past weekend in Monache Meadows without any issues. I fired it up and it read 5.6amps was being fed to my battery. The controller is nice with a LCD readout and various settings including type of battery and a timer for the accessory load (i.e. lights). Here's a link to more info on the controller's features and the manual:
http://www.epsolarpv.com/en/index.php/Product/index/id/149/am_id/134
The overall build quality is much nicer than the typical ebay versions, the wiring has a protective jacket, the battery clips are better and connect via Anderson style plugs, the legs don't feel flimsy and the bag is semi rigid and provides more protection. It costs more but I think you get what you pay for in this case.