Only been on Rip Ride Rockit. It was a painful one and done coaster for me. It looks pretty watching it, but is by far my least favorite on Universal property.
On the more positive side, the park redeems itself from that disaster with Mummy just around the corner, which is by far my favorite coaster. (Though it may be dethroned to the number two spot if rumors hold true of Velocicoaster's reputation when we experience it real soon.)
Hollywood Dream looks nice via YouTube, but we've never made it to that park or continent.