I have one. Great quality but still a bit steep for what it is. The clamps have no rubber grommets like most of the tower mounted stuff I've dealt with. So, I scratched my tower up a bit while in the process of getting the clamps in position. In hindsight I should have wrapped the area in cellophane while measuring and moving things around. Then, once in position marked and mounted them a final time.
Folding isn't exactly slick. It's actually a bit of a pain to get it rolled and in the boot.
All that said I think mine looks great when open and provides a lot more shade than any of the universal options would have offered.