I got an Eye-Fi Pro X2 from ebay...
Problem is: I can't use it.
It asks for username+passwort and does not let me
register a new accoount.
According to support these cards are fixed to their account and I cannot reformat that card without username and password of the old owner.
It takes them about a day to do that on the server side.
...someone in product management seems to have f***** uo big time at Eye Fi.
* see their forum
* see an Eye-Fi card dissected
* see eCos patches eye-fi made
* see free Eye-Fi server written in python
* German: Eye-Fi mit Android
* coverage for automatic geotagging