So far.. the counter points are:

Racks need adjusting before mounting.
Can't find parts readily in some backwards bombed out country on your 40000 mile tour.
Too cheap to buy it.
Too weak to ride with a few extra ounces.
Too dumb to adjust it.
Ass too soft to take the bumps.
Too inexperienced to use it properly.

Wow that's frightening the type of people who dislike disc brakes... except the guy on the 40000 mile tour, he's cool I guess.