Have you ever sat down watching the television and were blinded by the sunlight coming in the sides of the curtains that didn't do what the Umbra rods due. We have, most annoying, not to mention blinding. These take care of that 100%. I would imagine depending on the type of curtain you have you would also save on heating and air conditioning because of the curved feature. Don't think twice about it, they are worth your purchase. You will Love these too!