I raced the 8hr too, with luxurious full suspension and a number of gears. It was pretty hard. Especially listening to my riding buddy bitch about how much it sucked on a single speed. There's sections which have anti-flow, there's pinchy climbs and there's baby-head rock gardens in places that will make you cry. But there is definitely some hilarity and I'd ride it again. At the least pack some big bag tires, shorter gearing and some cement pills.
If I'm permitted a bit of shameless self promotion - the video I made is here:
[video=vimeo;30586232]http://vimeo.com/30586232[/video]
And my mate on the single speed made one too:
[video=vimeo;29366869]http://vimeo.com/29366869[/video]