I have 3 QS4's mounted with FMB's...2 on the side walls and 1 from the ceiling behind my head (when I'm sitting in the "captain's chair"). The brackets are very sturdy, although I've read where some people put a large rubber washer between the speaker body and the bracket...it's hard to get the little screw tight enough.
I got the brackets just to give me a little extra "adjustability"...you can change the angle up-down and side-side very easily. And the rear speaker looks better with nice shiny gold banana plugs stickin' outta it!!
And the QS4's are also deceivingly heavy. I dropped one while mounting...off my wrist and onto my foot...thank God, no damage to the speaker!! Me on the other hand..."it's just a flesh wound"...
