I got these for my son’s room - it gets super hot in the summer and super cold in winter.  On the positive side, I think they function great.  I’m not sure I would say that it’s 100% blackout but it definitely helps with blocking out the heat during the summer and keeping the warm in during the winter.  Maybe my one gripe with it is that it’s got sort of a sheen to the fabric which I think makes it look kind of cheap and sort of like a tablecloth, in my opinion.  I probably wouldn’t get these again because I would want to go with a different look but functionally they are great.