I tuned and the only issue I ran into was that on my first attempt to upload a tune, I got an error saying that the tune could not be uploaded because my battery power had dropped too low. The car had been sitting for a couple days so I'm assuming my battery wasn't optimal and I know they recommend putting a charger on during the tunes but I really didn't want to go buy one. I also have a feeling that this battery is close to it's last leg...
Anyway, I had to run a few places, so I drove for about an hour (which I'm assuming helped charge the battery). As soon as I got home, I turned the car off and went through the tune procedure which takes 5+ mins. I was concerned I would get the same error but this time it worked.
I have the "Performance" tune set and so far I'm happy with the throttle response and it really cleans up the shifts - quick and firm rather than slow and sloppy.