Originally Posted by Mike@N54Tuning.com
Sending DME's back and forth for dealer visits is one headache. But I think the real issue is updates. New tables are found all the time and little revisions to the flash maps are frequent. So keeping the flash side up to date with the latest VANOS change, or IAT decay, or whatever else these guys have planned, could be a real headache unless you can load the flashes at home.
It's interesting that you refer to it as the BMS flash conveniently leaving out the fact that you have to pay for a $800 Cobb AP in order to flash your DME.
Also, as Spool Twice mentioned, you can only set it and forget it if you have a steady supply of E85, if your fuel mix changes dramatically, well, you better be monitoring your data logs pretty carefully.