There are some good 3Ds, but let's be honest the trackwork is terrible and seriously inaccurate. I can see how much work has gone into it but the trackwork really lets it down.
You can't say things like "I know about the red g's" etc. and then still upload the ride. Sort the g's out.
The car collides with the building inside on more than one occasion. If you look from outside you can see the headrests of the car sticking through the roof at one point! That's a lot of decapitated riders!
All in all, I can see that a lot of effort has gone into the 3Ds, but the trackwork really ruins the experience.