I bought two rods for standard online black out curtains.  After twisting as tight as possible, I found the rods slid down the sides of the windows.  Expected them to be sturdier and hold better, so I am disappointed.   Had to jimmy rig with a different end so the rods would hold up.  When I pull the curtains across at night, the rods shake and one set of curtains came down one night.  Cannot imagine how they are advertised to hold room divider curtains!  Glad they worked for other reviewers, but  be aware if your window length is longer than shorter you may have issues. 

Pros: Nice looking.....
Cons: Not as sturdy as advertised, expected wider rods.  Slide if not using light panels versus heavier curtains.