So easy to mount, simply level off and screw in the plate.  Attach the arms to the TV, hang and tighten the screws.  The only drawback is that it appears you have to take the TV off the wall to change the angle.  However, they give you every possible piece of hardware you could ever need.  My Panasonic TH-50PX77U was up on the wall in about 30 min.  Just make sure you hit a stud, which is easy to do given the number of holes in the plate...