I have used the Strong Mounts version and Rocketfish (BBY). Honestly I kind of like the Rocketfish one more. It looks a lot like the Omnimount but possibly has more options for depth.

Strong Mounts is the best for depth adjustment when you have a deep speaker. They say 1.0" adjustment but you can flip the adapter for a lot more adjustment. The bummer is the lateral adjustment is minimal. It usually works but not always. One time I used it, had to mount diagonally, and cut the big rectangular section so it wouldn't show.