Lou,
I would ask Rock directly. He has a thread here:
http://www.tnttt.com/viewtopic.php?t=30521&highlight=harbor+harbour+freight+solar where he is testing the same kit that you are looking to purchase.
The first thing that I see is that when set up, it has almost a 3' X 3' footprint when put together. It would be awkward for me so I would look for something different, either a single panel or two panels that I could fold together.
The second thing is that I would ask about the warrenty of the panel. There are panels out there with 30 year warrenty and I have seen some cheap ones with none. If you are in it for the long haul then get some with a warrenty.
To answer you question how does it compare. It is a little bigger and a little cheaper than what I am wanting. It could be exactly what you are looking for in a solar solution.