No flames here.. lol.
Some have reported improved MPG. Not worried about it myself.. figure it is what it is and I'm not selling because I don't get xx mpg.

And you get emailed back the flash file that you can store where you want- has stock tune and EC tune imbedded, and the one you send in has a different file extension so you could save it just for grins if you wanted.. and the flash drive would be fine with 512 MB of space. Maybe even a text file of anything else related to flashing your car (fan disconnect or whatever..) for future references