Worth the $$$$
I purchased this tuner because 1. Good price 2. Limited options for my sport trac 3. Adjust the speedo for bigger tires "32's". It has definatly added some pep to acceleration and shifting seems smoother. I've only ran "regular gas" tune so far, but will be switching over to "premium" to compare hp/tq gains. Overall, very pleased with my purchase and would buy again.
I think there is a small difference
Comes with some great video instructions. Installation took a little longer than with other programmers, but that could be the car (car dashboard was unnervingly active during installation). I opted for the "premium" tune. Overall, I think the gas mileage went slightly up, and I feel a little bit of a power difference. Even if the promised 29 HP is accurate, the value in this product is the ability to read trouble codes, as the performance increase is mild.