I've ridden it and it is very cool. It's a great blend of math, engineering and fun. I know that sounds like a strange combination, but I'm a marketing guy for a bunch of engineers so I have to figure out how to make those things work together and seem cool!
We built a roller coaster and the trick is to go as extreme as you can and stay in the limits of physics. It gives you some really good guides to let you know if you've gone too far or if you still have some thrill left. It's very interesting to watch the math formulas that are involved with each step in the building process because it gives you a feeling that this isn't just some random attraction where you get to ride a simulator, it shows you the things that you need to know to actually build your attraction.
One of the interesting parts is that the building portion is timed. Once your time runs out, the computer finishes building for you, so if there is a particular thing that you want your attraction to do, put it in early or move through the build quickly.
The ride portion was great. Two seat near full motion (I say near because it doesn't quite go upside down) simulator where you "ride" your ride. You really do get the sensation that you're on a roller coaster, and even though the sim doesn't go upside down, you certainly feel like you do when you're in it.
I have to give a shout out to the ride engineers and imagineers at Disney on this one. It's a great ride that very subtly mixes math, science and engineering into something that is really a lot of fun.
As far as the crowds go, I was there on a Friday afternoon in Mid-February and the wait was 20 minutes, and that was pretty well spot-on for how long it took to get through the line.
Hope that helps.
