When I do my install (any week now!) I was going to write this up, but there is a new flexible option out there, and I have one sitting next to me:
Basically, all the advantages of flex and low profile with the output of silicon. And yes, I've walked across it and rolled it and it's fine. Only issue I think will be that when flush mounted, you'll lose some efficiency due to the temp buildup. However, a 130W flat panel that is lighter and lower profile (wind resistance... hate it) is what I was after, and it's what I found.
When I finally get around to installing (don't have time in the forseeable future), I'll do the write-up.