The biggest failure point is with the cord itself. As it is repeatedly compressed by the action of the tightener, the rope fibers get crunched and broken, and it finally fails right at the end of the tightener. This shouldn't be a problem on the playa.
Hope this helps...
It does, thanks! I already knew I would need a different kind of rope, but I'm glad you pointed out that it's a good idea not to make it too tight. I live in Reno so I'm actually going to do a test run this weekend.
One of the reasons I started looking into fasteners is because it seems I always arrive late at night in a dust storm, and I put up my structures on my own. This year I'm also taking out my son for the fist time, so I was thinking using things like these would be a good way to set up as quickly as possible, if need be, and then adjust later. Maybe even tie some knots.
Thank you, I did not expect to learn so much from this thread!