I only saw a handful of crossers. The Surly guy was uber-dedicated. I rode the last 1/3 of my 1st night lap with a guy on a Specialized cross bike. He was smokin it and I have to admit I spent more time behind him than in front. I might bring a cross bike to complement my Mtn bike next time but unless you are really competent on a cross bike (meaning dismounting and remounting as well as handling) I would stick with Mtn...at least on this weekends course.