I just got a XCalibrator 2 last week. I got 87 torque, 93 torque and 93 perf programs. The difference in power is noticeable. There's also cool software that goes with the tuner at www.sctflash.com
. It lets you view and log PCM parameters in real time with a laptop. The tuners also let you make changes to compensate for larger tires. IMO, this is one of the coolest features. Definately worth the money if you plan on keeping your truck for a while.