yeah, i pretty much agree with RegularGuy - aero bars are made for speed and they really make it hard to control the bike as well as shift gears and brake unless you buy special brake/gear extender which are usually not cheap. main problem is that your grip is really narrow to reduce your wind profile and this really hurts your ability to control the bike.

i think if you were touring really light then the aero bars might work out, but i don't think i'd feel safe riding with lots of weight in the aero position... and i would definitely try it out before a tour.

as far as comfort and addtional hand positions which i think is what you're probably looking for for touring --- look for something made for touring of just simple MTB bar ends - i prefer my mountain bike for touring and have long bar ends that give me 3 additional hand positions while still pretty wide with decent control - i can even lay my forearm/elbows on them like aero bars but again the bike control isn't ideal (although better than aero b/c a little wider)