I was down at Universal for the past few days and got 3 rides on Rockit. The roughness of your ride completely depends on your car/train.
The first of my rides (car 1, row 2) was utterly miserable and was comparably rough to a wooden coaster. It was jerky and shaky and actually caused physical pain after the non-inverting loop. My second ride was a little better but still rough (car 2, row 3...very back), I was at least able to enjoy myself and get some airtime off a few of the drops. No pain, but still far from being a smooth ride. My final ride was actually fantastic. I sat very front row and the ride itself was extremely smooth, about the same as a B&M Hyper. This shocked me considering my previous two experiences. Not really sure why there is such differences between trains and even individual cars, but there certainly is.
Once they get all the cars performing as on my last ride, this ride will be great and enjoyed by everyone who gives it a try.
