I had BFG ATs on my pickup - couldn't hear them at all (and I definitely am sensitive to tire noise). Granted they were new and I only kept the truck for about 20,000 more miles, but still...it isn't a loud tire by any means. They're quiet on my father's K5 too (and those definitely aren't new - wearing down pretty low).
Plenty of legit criticisms of the BFG KO...but noise really isn't one.
http://www.1010tires.com/tires/Reviews/BFGoodrich/All-Terrain+T-A+KO
Noise 2.5 from 5.0