I love how easy it is to zip and unzip without "special tools". I bought the first set, used it for a few months and thought everything was going well. And I bought a second set and it broke on the first day. (see photo) I think the plastic part is not that strong. I don't know if it already had a crack when I got it, but it's too early to break. I think I can stick it back but since it's new I sent it back and am waiting for a replacement. I think since it's designed for outdoor use under lots of sunlight and also exposed to wind and water, it's better to be stronger. Maybe you get what you paid for.