Unfortunately I've never been able to ride it. It's been down both times I've visited since they opened it. That's my biggest complaint with the ride, it breaks down far too often.
I do have to shake my head when people complain that it doesn't fit in with the future world theme. It does just as well as the ride it replaced, World of Motion. Most of WoM focused on the past, the only futuristic part was the ride through the city of the future (which was very very cool in the early 80's) and some of the post show things such as the parrot and the robot. Other than that, there was nothing futuristic about that pavilion either.
That's a big misconception with Futureworld. It was never designed to be all futuristic. It was more designed to be educational with an eye on the future. Test Track fits that bill. Every time a car gets tested, it's getting tested for a car of the future. It may not be a ride about 50 years in the future, but it's about cars coming out in the future and it's educational so it fits in with the theme as well as any other ride in Futureworld.