The price can't be beat however my 40 pound 55 inch television tends to lean out of level about a half inch one way or the other depending on which direction you swing the arm.  This is a common problem in single arm articulating mounts, If you don't plan on adjusting the tv swing or tilt much, you can compensate for this by installing the mount to the wall out of plumb or lifting the which ever tv side is low and  tightening down the side the screw that locks the tilt adjustment.