I would say a Huff GF would be one of the most terrifying flats around! But nice pictures, sad you couldn't get into SFGadv to compare Kingda Ka and Top Thrill Dragster!
I only rode it once or twice this year. The only really bad part is the bottom of the butterfly turn, which is just plain brutal. The rest of the ride is fun, though I'd much rather be spending my time riding i305!