No noticable difference
Bought based on other reviews saying people "woke up to brand new truck!" I tried all quick tunes for 300+ miles each, saw no difference in behavior from any of them. Unit confirmed the program was in place when I next connected, so I know it downloaded correctly. 7.3L Powerstroke, stock, pulling 7500 lb trailer (mileageXS used with no trailer). Note after flash you must leave key in place for 20 seconds two times for anti-theft to disable and allow it to start.
Easy and versital
This Cortex is great! I installed it on my 2002 F350 7.3 and could tell it shifted different and was saving me some diesel. I love it that you can download the latest program. I use it on my diesel for weekend four wheeling and then return it to stock and use it on my Mustang during the week.
Good tuner for the money
Good for the price. Performance program set theft mode when installed, but quick call to excellent tech support got me going! Power gains are definitely noticeable with performance and light tow programs as are improved shifts. Mileage gains with normal driving are questionable at this point. However in all fairness I have yet to upgrade exhaust (a must when adding fuel from tuners if you want longevity and top performance from tuners) and compressor wheel (to eliminate surge). Would buy again.