I'm a commuter and I use a mountain bike. I don't mountain bike on the same bike I commute but my friend let me try out his mountain bike with disc brakes not too long ago and I loved how responsive they were. I like the stopping power and quickness of them. What are some advantages and disadvantages? How oftend do you have to adjust your brakes? What are some of the maintanence duties that need to be done if any and how often.