I just did a system transfer from my Ambassador 3DS to my FE 3DS. I wanted access to those titles and switching them back and forth was a pain. I called Nintendo and was assured my two people I would lose nothing in FE13. I clicked do not delete.
I lost 400+ hours. I had a party min-maxed, beat Apotheosis, unlocked lunatic+ and completed the support library. It's all gone.
Granted I wasn't planning on replaying the game any time soon, and if I did it would be another min-max playthrough. What really bothers me is the support library. That's gone and I don't have the patience to redo it.
Just thought I'd rant a little. I'm just that angry.