I have/use one of the Mopar car covers on my Challenger everyday and find the fit and finish to be first rate. It doesn't appear to be suffering from the 110+ Phoenix heat, and stays put even in windy conditions.
I purchased two California Car Covers, one for my '67 Charger and another for my Daytona (not the top of the line but an indoor/outdoor style), they lasted around three years.....but, I never really took care of them, and failed to tie them down correctly in windy conditions, never let them air out when they get wet from the rain and snow (in Prescott, not Phoenix), so it was really because of me that they didn't last.
But to the credit of California Car Covers, they stood behind their product and replaced both of them as they had a five year unconditional warranty. I would buy from them in the future as I like the way they do business..............