I really can't say enough good about this kit.
I used it to mount an older set of Infinity TSS-450 speakers to the ceiling in my basement. My only complaint (if you can call it that) is the arms that adjust don't go a full 90 degrees. Probably not a big deal for most folks but in my setup, mounting them from the roof meant the L and R front speakers were pointed more towards the floor than where I wanted.
I solved this by taking the arms apart and using a chisel to gently shave off the point that was getting in the way. Hard to tell what I mean by the pictures but when you go to adjust them you'll see what I'm talking about. I only took off about an 1/8" and it's very easy to do, taking all of 5 minutes to do both. But this allowed more articulation and I was able to point the speakers exactly where I wanted. They've been up for about 2 weeks and everything is holding in place right where I put them.
But my favorite thing about this kit is the fact that it also allowed me to mount my center speaker as well -- something I never thought was possible. As I mentioned, the TSS-450 is old... a good 15 years old and the center speaker was meant to sit on a shelf or on top of a TV that wasn't flat, so there's no 1/4" 20 thread hole on the back.
But what the center speaker DOES have is an adjustable rear foot, allowing it to go up or down. So just for giggles, I unscrewed that all the way out ... and one of the screws in the mounting kit fit!! I had to use an extension to get the clearance I needed but so what. That's what they're there for, right?
All in all, this is a great kit with tons of options for any scenario. I highly recommend. Also, check to see if there's an Open Box available. It's 10 bucks cheaper for the exact same thing. : )