it's a blast! caveat: i don't race, so......
i've got a crosscheck set up SS fixed/free right now. it's my commuter, and sees most of it's time as a fixie. i've taken it on a few of the mellower trails around me though (in freewheel mode), and it's a h#ll of a lot of fun! no pics up at th moment, as i'm at work.
if it dies, it'll be replaced with this frame, which i consider far more dead sexy.
http://www.on-one.co.uk/products/ilpompino.shtml