My sales guy installed the boot cover when I took delivery of my car (note: despite GM marketing, it's not really a tonneau cover). That's the only time it's been installed. I do have rub marks on my top though. Nothing I'm worried about, it's a convertible, it'll get marks on the top. I'd be massively impressed at the failure of GM engineering if driving w/o the boot cover does any appreciable damage to the top. With that said, it is a little annoying to look in my rearview mirror on the highway and see all the flapping.
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