I hear a lot of "big ass stories" about squatting ass to the floor but have yet to experience it myself. Ever since I started going ass to the floor, I've gone from 225 for reps, to 405 for sets of 5, and my ass has just grown proportionally with my quads.
Frankly, I wouldn't mind a bigger ass, when was the last time you heard a girl say "His ass is too muscular"