I bought two for bedside lamps.  The part holding the shade on one was almost 1/4 inch shorter than the other, so one shade was lower.  I had some lamp parts that I used to jury rig it and make it look more even across.  Also, there was no template to help place the plate on the wall, the directions were useless and the cord cover was difficult to mount.  However, I do like them and will keep them, but am disappointed.