I sold my car and have a JB Diesel Tune with the Can Tool (for resetting). I only used it for about 6 months, but ended up selling the car sooner than anticipated.
The device works as advertized and is worth every penny. SAFE $100! With tax and shipping this will cost you close to $100 more that what I'm selling it for.
For more info check this link:
http://www.burgertuning.com/BMW_JBD_...ance_chip.html