I just want to warn you, if you car pings, it will get a lot worse, with the SCT programmer. If it doesn't, it might start pinging.
I have had the SCT tuner for a while, in and out of the car. Currently, it's not downloaded into the car, cause the damn thing starts pinging at 4000rpms up to redline.
Not to mention, all of my sparkplugs and COPs were changed 10,000 miles ago.
Other than that, i think it's one of the best mods you can do as far as the performance goes. It does make a noticeable amount of difference.