I checked that link and had to laugh at that price...$95.00! for a set of Vent Visors? I put on a set of 4, over a year ago that came off eBay for $15.00 plus S&H (shipping cost more than the VentVisors)Still, overall cost was well under $50.00...
The Versa has very large side windows and very short sunvisors.
When you are on the road early in the morning or late afternoon, the side window sun will drive you nuts. The VentVisors give you about another hour of shade before it starts coming in underneath them. AS for your question about durability and installation, I think the ones that just 'peel and stick' work out fine and only take about 5 min to install.
http://picasaweb.google.com/longo3002/VersaPics
I love mine..you can see them installed with a little extra chrome trim, in the above link .....Use the 'Slideshow; feature to enlarge and auto scroll.