Bryce,
I have a Chief mount and some instructions:
1. The Chief mount comes with a threaded 2" plate that you bolt to your joists.
2. The Chief mount comes with a threaded 2" plate that connects to a plate that mounts to my projector (quick release!)
3. The Chief mount comes with the plate that attaches permanently to my projector.
4. I went to Home Depot and bought for about 20 bucks a piece of 2" steel tubing that they threaded IN THE STORE (free!) at the exact length I needed the tube.
Now, if I want another piece of 2" tubing a different length, then I go into Home Depot and pay them a few bucks to recut my left over tubing to the length I need and add threads. Easy.
Now, if I get a new projector, I just order a new plate to mount directly to the projector which will then quick connect to the 2" threaded plate above it.
Is it better than the new 'universal' mounts? Man, heck if I know... But, I figured I would just let you know my experience with my mount which I have been happy with. I would think the new universal mounts would work fine with your projector if it follows a 4 hole pattern, but you can likely e-mail Chief or the manufacturer of the mount you are looking at to verify that it works with your exact projector.