Discs add weight, though they get lighter every year. I don't think the safety issue (injury from the rotor itself) is a big deal for most people. I have mechanical disc brakes on my CX bike (bought as an inclement weather bike, really), and getting them adjusted was a pain in the neck (I had to do it myself), but it shouldn't be an issue if you have the shop do it. (Also, get a step up from base level, More adjustability. It helps loads when they bash your bike in transit and the rotor gets warped.) There was some adjustment involved on the rider side too, since when I squeeze the brake levers, it STOPS NOW.

That said, I'd be fine with hydraulic disc brakes on a next road bike.