With DLP being my local park, I have to say that as much as our Space Mountain is awesome and a full inversion coaster, a lot of us are wary of riding these days as the ride itself is not very smooth - and even with shoulder and head restraints we bash our brains and come off with headaches!
That being said, R'n'R here is smooth, but you feel like you are going to fall out if you are slender like me :-/. I was shocked with the Magic Kingdom as I hadn't done my research, but I still loved it! Slowing it down would be all to sad!