I installed this for Sony X900E 75" panel. Wall mount on drywall, at top mount-hole at height of 78". Find the stubs, drill pilot holes, secure the wall mount, and attach the mount arm. It took me about 2 hours to do those. Hangs 75" TV no problem, and very easy to adjust. Highly recommended.
I did have some problems while secure the arm piece and find the suitable height:
(a) Sanus has a web site to find the mount hole height. It is very useful. However, one of the options seems not work correctly. When it asks if the TV attachment is center mount or non-center, I select as non-center because the mount to this Sony 75" TV is close to bottom, not center. The recommended measurement is way to low, so my first drill holes are quite off. Then, I did it myself, and my measurement is pretty the same as Sanus's "center" mounted numbers. So, BE SURE YOU CONFIRM THE NUMBERS BEFORE YOU DRILL IF YOU THINK YOURS IS NOT CENTER MOUNT.
(b) The TV is secured to TV arm pretty well. However, the TV arm allows TV to rotate a bit (I guess that is for users to adjust level?). It does not bother me a lot, however, when I adjust the TV, I need to adjust the rotation a bit every time.
(c) There are two plastic covers to hide wall mount screws. These two plastic pieces are very hard to detach, if you do not detach it carefully, the "tiny lock" mechanism will break easily. I need to quick glue those small pieces because I broke two of them. Be sure you bend these plastic covers a bit to detach them.