If you haven't heard of it, here is a link to the event website (it hasn't been updated for 08).
Basically it's a century+ around Austin with the route being such that you hit all the biggest hills. They say something like 14,000 ft of climbing. So has anyone here ever done it? I'm guessing it's something you seriously have to train and be in great shape for, not something you can push through and finish w/o training like the MS-150. What were your thoughts?