For an '06 Jeep Commander, The jury's still out.
The unit appears to produce more horsepower from my Hemi. I have noticed a couple of MPG improvement. But, changing the settings can be tedious. Bullydog really needs to improve how one accesses the settings in a more straight forward manner. Overall, I'll keep the unit and with time, I'll like it better.
2010 Jeep Commander
AutoAnything provided fast delivery, the order process was easy and the representative was knowledgeable and helpful. The programmer was easy to update on line and programming my Jeep was painless (15-20 mins.) I have driven about 3,600 highway miles. Driving 70 mph yielded 23 mpg with a best tank of 24+ mpg. Around town is close to 17 mpg. Noticeable improvement in acceleration and passing power. My wife did not know that I had re-programmed the Jeep and noticed the difference immediately.