So funny you bring this up right now, I am looking for a new commuter with disk brakes too. I too live in a hilly area and its rainy sometimes when I commute. I'm very familiar with the 'coasting' to and then climb all the way home, ugh. One thing to consider that I hadn't is that brakes pads in that kind of terrain wear out QUICKLY. This has been a real issue for me, I've gone through 3 sets in a year. I have a lot of 30 mph hills with a stop at the bottom. My brake pads literally smoke sometimes. I've been caught in some really nasty rainstorms and it was then that I also longed for my old mountain bike with disk brakes. It just felt sooooo much safer. Had it not been such a goofy fit for me I would have kept it for commuting. I fully support disk brakes for durability and stopping power in rain.