The only thing that let these curtains down was the packaging. The are have a ribbon wrapped around them and the ends of the ribbon are held with a sticky backed foam pad.  On opening the first pair I found the pad had moved and was stuck to the curtain, on the darkest part leaving a sticky residue. I returned those to be replaced with another pair. On opening the replacements I found the same problem. I haven't returned these as I thought I'd try to remove the myself. A third pair of curtains, fortunately, were okay.