Scream isn't rough in the traditional sense, but its rattle gives me a fierce headache after only one ride. It's the only ride at SFMM that I consider unrideable. To compare, I rode Medusa at SFDK this summer and found it a fantastic, smooth ride. As for some of the other B&Ms mentioned in the last few posts, Vortex is a brutal headbanger and Diamondback is butter-smooth. If Dback had a little rattle, it didn't bother me at all after about 15 rides.