We used these on camp in pairs charging Goal Zero Escape 150 Battery Pack to eventually provide power to Goal Zero Light-A-Life LED Light. The panels lived on the side of a marquee outside 24/7 in the best of British weather (rain/sun/dew/cloud/drizzle) for 10 days and provided more than adequate charge to power 8 Goal Zero Light-A-Life LED Light lights each night. Incredibly simple to set up (our teenagers caught on how to use the kit before it was out of the box) and very robust. I was really surprised at the amount of charge produced especially in low light levels (early morning and before dusk) and in the cloudy conditions that prevailed for the majority of the 10 days.
The only wish for these would be that they come with a better fixing mechanism - I propped these on the end of the marquee supports which wasn't all that ideal. I would have preferred something like a giant carabiner to feel secure. That said, there are large slots for string/rope fixings around each edge.