The device does what it says. It disables the AFM and takes away the hesitation and the sluggishness. I used to have a 2005 NBS Tahoe and I regretted exchanging it for a 2013 NNBS Tahoe due to the sluggishness caused by the AFM. Now I am enjoying the newer truck due to more responsive throttle. I did notice a loss of 0.5 MPG but it's worth it for the truck to not feel like a big slug.
2003 ford ranger
Tuner was easy to install and showed results fast! I use it on the performance mode and use it as a daily driver. I also installed a k&n cold air intake and overalls I've gone 3mpg more then the stock mode. And that's because I also installed 33's Cooper STT Pro's MT. Overall very satisfied with my purchase and I would recommend it to everyone!