DH, DS9 and I went on it in January because it was a walk-on during EMH. None of us liked it. It wasn't scary for DS, he just thought it was dumb.
Other DISers had complained about the harnesses being tight, so I put my fists on my shoulders to keep it from clamping all the way down. What bothered me was the shape of the seat. It is hard plastic, and there is a ridge that hit me right in the middle of my spine. I have back problems anyway, and that seat was horrible.