The partly negative reviews here I can not share. I have the film at a Velux roof windows mounted alone and had no problems with it. However, I have the film not first attached to the back on the window, and then remove the protective film, but I have the backing previously removed, as recommended in the installation videos from other manufacturers / distributors. I have now only wait to see if the film also keeps longer at the window. To me it looks at the moment as if it would be so. In other than the breakfast somewhat excessive darkening'd bother though, because if you are looking for something in the closet, you have to turn on the lights even in the sunniest day.
