Pros: -MPG Booster tune did yield a 0.5 MPG increase in my otherwise stock Ram 1500 Hemi. That is mixed city/hwy. -91 octane tune did result in a slight but noticeable increase in power and acceleration. -Fast shipping Cons: -Cheap hardware. Resistive touch screen. Very slow to save backup and install first tune (I sat for about 2 hours in a hot car for this). I expected better hardware for $400. - 91 octane tune decreased my MPG by about 0.3 MPG in mixed driving.