Let me first say, I have only been on one. And that would be, Serial Thriller at SFAW.
The only part that will bang your head is the last part of the drop. Just keep your head to the left on the first drop, than back against the restraint on the rest, and it's a really enjoyable ride. The funnest part of the ride was the inline twists. They were smooth, and just so fun, too bad BTR doesn't have any.