Originally Posted by AlexK

Yea, pretty much - Dinan's software voids your BMW-provided warranty and it is then up to Dinan whether they want to fix your car or not. Also the Dinan's warranty only works for new vehicles not older than 4 years or with less than 50k miles, whichever comes first. After that, you're pretty much screwed:
"In the event of a warranty claim, Dinan will repair or replace, at its sole discretion, any defective Dinan component upon receipt of the item and proof of the original purchase in the form of a lawful invoice. This warranty does not include reimbursement for repairs to any original vehicle manufacturer's component(s) that may have been affected by a Dinan component."