Got mine this last Friday. It took 15 minutes on the computer to register, and 15 minutes in the truck to save the original program and write the 87 tune. Very easy and quick! I noticed an immediate difference in the low end, and a much quicker throttle response in the entire operating range. Works with my factory remote start as well. I put in the Diablo tune, which caused issues with the remote start; after some digging I found out that tune was a high octane tune, so I went back to the 87 tune. There are alot of parameters that you change; spark, fuel, transmission 1-2 and 2-3, throttle boost, tire sizes, MDS on/off, Traction Control on/off, plus others. Logging allows you to view about 12 parameters. Awesome so far, wish I had more time each day to play with it!