I had a large window to cover and I decided to take a chance on these.  They are pretty much what I expected although the top layer is very transparent.  They do a pretty good job but I give 4 stars because my window gets mean afternoon sun and they don't quite meet that standard.  I do, however, think that in most instances they would work just fine.  I do like the look, and that they are lightweight.  I would recommend these to a friend as they are attractive and priced right for covering such a large expanse.