They work. as long as you don't have pets or kids with aggressive paws or fingers these work well. Very easy to instal. I love how they open from top down if you want them to. My only gripe is that there is a little gap at the top that light shines through (not a lot of light) they do a good job of blacking out sunlight... just make sure you measure correctly. I only gave it three stars because they are pretty delicate so you definitely need to be careful with them.