Clutch makes the kind of music my wife would never, ever allowed to be played in her house. Fortunately, they make the kind of music I myself would never listen to in my house (or car).
However, I can say that I caught them for about one song at the 9:30 anniversary show, and found them quite captivating in a live setting. Don't know if I'd want to endure them for 90 minutes though.