The Harbor Freight kit has its limitations, but if it meets your power needs and your panels are covered when you're not using them it is an OK solution.
Things you should know:
There are three commonly available types of solar
panels: amorphous coating panels, polycrystaline, and monocrystaline panels. The 'crystaline panel types have a number of advantages: they produce more power per square foot of panel, produce power over a wider range of angles of the sun, and they last longer when left out in the sun. (Solar rays slowly delaminate and damage the amorphous coating in the Harbor Freight cheapies, but if you take them inside or cover them to block the sun's energy when you're not using them they'll last a long time.)
It all comes down to how much energy you use each day and how much energy your solar
panels make. If you don't use a forced-air furnace
(or do your camping in places where you don't need your heater) and have LED lighting
in your most-used lights
and don't have many other draws on your power, the HF panels might just do the trick. Several people here have reported using them with good results.
And, yes, Frederick's portable panel setup is cool! Another cool setup is (Gina's?) rock-guard mount, though that's just one panel, I think.