XCalibrator has been replaced by the Xcalibrator2. Xcalibrator2 has more features - user adjustibility, data logging, ...
Both are pre-loaded with tunes from a dealer.
There is a new one call XCalibrator SF - which comes pre-loaded with three tunes from SCT - not a dealer.
Using a dealer hase the benefit of making changes later (if you make future mods) and they can make a new tune and e-mail it to you.
Buying a used one:
- has to be 'unlocked' from the last car's VIN
- has to be erased - since the stock PCM code will not work on your car
- has to be reloaded with new tunes from a dealer built on your PCM code
The tunes can be e-mailed to you and uploaded into the device - but you have to find a dealer that will work with you (and charge you for the tunes).