I see. The response I got was pretty short and concise (Which honestly, I wish it wasn't)
They said if your primary concern is performance, they'd go with gopedal and ecu tune, unless you want cruise then go with cruise and ecu tune. And that it is programmed to the vin. So, used ecu tune is a no go.
And blackout, if your car is still pretty much stock, buy a k&n performance filter, I was impressed with the throttle response difference.