I programmed mine yesterday, and can echo what others have said. There's a night and day difference between the unprogrammed and programmed soundbox. Specifically, bass is much more pronounced and the overall staging is much improved.
On another note, I'm astonished at how little VW dealers seem to know about this product. I called three in the Atlanta area to try to schedule the programming. Two had no idea what I was talking about and the third said that I would have to pay $170 for the dongle. I am grateful to wy2sl0 for making his available and to GolfUnV for graciously offering to let me use it before shipping it to the next user.