The DiabloSport i2 tuner is easy to use with simply touch screen menus. Not a lot different than using a smart phone. A simple MPG tune improved my 2014 Silverado's highway MPG better than 10% with a 3.5 MPG increase and noticeably improved performance, idle, and shift feel. I look forward to trying some of the performance tunes in the future.
The device does what it promises - Keeps the engine on all eight, all the time. My mileage has gone up two tenths and the transmission shifts less without the AFM. I would recommend that you cover the blue indicator light with a strip of electrical tape (or at least cover it partially). Great product all around.