I was thrilled at the speed with which these arrived, but when I got them, I was concerned that I'd possibly ordered the wrong size.  When you buy shades off the shelf, they're usually a bit smaller than their advertised dimensions.  Not these.  They are exactly as wide as they say they are, so order accordingly.  Fortunately, mine fit, perfectly.

I spent a little more time installing the first one, but the second one was up in less than 10 minutes.  Very easy to install, and they work flawlessly.  I needed new shades because my cats kept nibbling the strings off the old ones.  Solved that problem in just a few minutes for an extremely reasonable price.  Highly recommended!