The really nice thing about disk brakes is that you won't burn through rims..... I put a lot of rainy miles on my commuter/winter training bike (which has regular side pull brakes). I put cool stops on it in the winter and I don't have any problems stopping - but I have to replace my rims pretty regularly..... I wouldn't mind having disks instead. They'd also be handy in the winter - I could put poor man's "bike chains" on (zip ties) or maybe even real ones. They do add a little weight - but there are certainly some advantages to disks.