Being able to adjust the horizontal mounting after the bracket is screwed onto the wall is an awesome feature.

This seemed to offer everything I needed (and then some) and the ability to position the arms any way I liked was an attractive feature, as it allowed me to "hide" the arms properly behind the TV without anything sticking out (a problem with many other mounts.

This was the most important feature to me by far.

This one does not, and this would be a nice feature to have, otherwise you better be very accurate when bolting it to the wall, and if you don't your tv will not be level

Easy to assemble, was easy to mount, worked exactly as a I had hoped.