I have a sliding glass patio door out to my backyard that has full southern exposure.  I had been using a black out curtain on a pressure rod for privacy and to help block the sun.  I had to use two panels and it was always a pain to close the curtain since it would catch on the rod.  This vertical blind is one of my best finds.  It was super easy to assemble.  I was nervous about trimming the panels to the length I needed, but even that went smoother than I anticipated.  I have been very happy with this in place of the curtain.