When I went to MGM Studio's last year, I was so excited to for this attraction. I was really looking forward to it because I really never experienced an
actual rollercoaster outside of the traditional mountain's found at Magic Kingdom.
When we got off of Tower of Terror, which I loved, we headed over to this attraction and noticed the wait time wasn't nearly as long as imagined. We decided we would give this a try. So we proceeded to enter and just as we did my Cousin [7 yrs old.] started throwing a fit! She wanted nothing to do with it. However, she loved Tower of Terror.

Anyway, to make the story short - because I was there with my Uncle and Cousin, I gave in and we skipped this attraction.

I could have easily met up with them later, but I didn't feel it was the right thing to day.
However, I do plan on going back to MGM Studio's on my next Disney Adventure [after Animal Kingdom] and I do intend to ride it this time. With or without hissy Cousins, Parents, or Siblings!
Oh, I did find something that may help you in your decision to ride it though. Here is a picture of the attraction [without the building.]