T'Ultimate is amazing. Better (and more brutal) later in the day though. We had ERT the other year for an hour before the park opened, and it was only just starting to warm up by the time we finished. Mind you, with 6 rides without getting off, it was probably just as well - the resulting bruises on my knees lasted weeks as it was. It really is fantastically fun though. Brutal, yes, but a hell of a lot of fun. It really is a unique experience, I've never been on anything that even comes close to matching it.
Oh, and as for Herb's pain scale, I'd go for a 6.5.