Perfect to help filter light.  It is not a blackout shade, but it does what it says it will do.   It's very easy to move up and down, compared to the corded blinds I had in the room previously.  I elected not to mount the inserts for the bottom piece, as I didn't want it to ever be anchored at the bottom, but that comes standard with this, so anyone who buys it will have that option if they want it.    All in all, a great find for the price.