I received my production model Eye-Fi Pro card today, after beta testing it for a few months.
Unlike earlier Eye-Fi cards, the Eye-Fi Pro supports RAW files as well as JPEGs and movies, which is great for anyone using a DSLR who likes to shoot RAW. Since it’ a 4GB card, it will hold 256 RAW files from my Nikon D90 or 1000 JPEGs. The Eye-Fi Pro also lets you set up an ad-hoc network with your computer for peer-to-peer connections without a router or access point when you lack a WiFi network.
As a bonus, it also geotags your images, avoiding the need for a GPS attachment for your camera.
See my full set of unboxing photos here.
The Nikon D90 is one of the camera models with built-in Eye-Fi support. It recognizes an Eye-Fi card and sets its power management accordingly, to avoid shutting off while an upload is in progress. It also adds an item to the setup menu which allows you to enable or disable Eye-Fi wireless uploading.
Using this card has changed my photography workflow. Instead of shooting pictures, then removing the card and using a card reader to import them into Aperture, I just let it send the pictures wirelessly to a folder on my MacBook Pro, where I can then import them into Aperture.
When I import the photos into Aperture, I prefer to keep them in their original location, rather than copy them into the Aperture library, which saves some disk space by avoiding redundant copies. iPhoto also offers the same option when importing from local files rather than a camera or memory card.