koaloha05, I used those for a while, but I'm not sure how windy of conditions I used them in. I used them on the 4 corners along w/ bungee tensioners, so that relived stress on the cleats of course. I can't say for sure, but I'm thinking there was a time or two when one of the cleats slipped during a windy night.
I haven't seen wear on the cords but I haven't checked them extremely close, so I'm not being much help on that.
I decided on my last tarp, to replace the cleats w/ a sliding adjustment (can't remember the name right off) because I don't find myself needing to adjust the corner guy lines that often because of the tensioners.
don`t leave the CREATOR out of the creation!