I think I prefer the overdrive that is produced by playing your amp at 11 to a metal distortion. It just seems more pure and you can still hear the tone of the guitar.
Don't get me wrong, I love my BOSS MT-2, but I would recommend checking out other pedals first. If you have tons of cash to throw away, check out http://www.fulltone.com, they have a cool overdrive pedal.
excuse me, but i must kiss the sky