I liked the Tron-like visuals...but as soon as I walked into the line it felt more like a huge ad for Chevrolet, rather than a sponsored ride at Disney World. I felt all the "Disney Magic" was missing from the ride and line. I liked designing my car, but felt way too rushed.
The idea of uploading your car into the ride vehicle was cool, but both times I rode it, my car wasn't uploaded.

I feel the aspect and timing of when you scan your card while in line to board wasn't well enough explained. The first time I scanned my car, it was uploaded into the vehicle in front of us. The second time, I asked a cast member when was the correct time, and then my car was uploaded into the vehicle behind us. So, the fact that the entire point of the ride was to see how your designed car held up against the others was completely missed by me.
Overall, the ride felt more like an "in progress" interactive advertisement rather than a completed attraction.