figured it was a easy question. Should have my tuner friday cant wait!

I know this may be a dumb question but what is DOD? I am aware of AFM and I HATE IT!!! but not to sure what DOD is and what it does for my truck.

I am thinking of purchasing a intune. Is there anyone out there that has a 2009 chevy silverado or similar that currenly has one that can tell me what they think. Is it worth it? Also what canned tune are you using. I have a Volant CAI and Magnaflow exhaust dumped.