I just checked on the Evolution at my local LineX store today. I want to get something for my 05 6.0, and the Evo is in my price range. The new model has the Attitude in-cab display, so you can change your tune from the driver's seat. Its not an on-the-fly adjustment, truck must be stopped, but still, you don't have to hook up an external programmer to do it. Plus with the new one, you get digital gauges to monitor truck vitals.