Given the very, very small population of Dinan Tune owners, AND the further constraint that you are asking about people with "issues and how they were resolved between BMW and Dinan", do you really think your singular post will be the way to attract and collect data?

You could have 40 people (HIGHLY unlikely) respond with 'dinan tune, no issues' but to what end?

What you really want to do is actively search for historical data on the internet (not just xoutpost) for these extremely rare events and how they were resolved. I can tell you that in my years of hanging on BMW forums, this specific issue has only come up a handful of times- and can be ugly to resolve. The benefit that Dinan has is that they have an insurance policy they can rely on, but if BMW and Dinan get into a pissing match, you are in the middle. But again at least you have Dinan and not some fly by night tuner who has nothing.

A