I had an SCT chip and had issues with it, I replaced it with a SCT tuner, More accurate programs for the ST, more precise tuning....
I do know one member here had the JET chip and hated it, Others have had no problems...
The performance gains and better HP and torque, better MPG if you don't floor it all the time and a better shifting tranny that runs cooler also....
But the JET chips tend to be a propriety thing and are not the best gains verse a SCT tuner...
Todd Z