I have been using Eye-Fi cards since they released the original version, although when I switched to a DSLR I had stopped using them due to their limited capacity. That changed with the Eye-Fi Pro card, which doubled the capacity to 4GB, which made it usable with my D90.
The 4GB capacity of the original Eye-Fi Pro card still seemed tight when shooting a lot of raw images & video, and it’s slower than most standard SD cards, which limited the number of shots you can take in burst mode. I found that limitation very frustrating when I was trying to shoot dance & martial arts demos at Youth Day when it stopped letting me shoot in burst mode for several seconds while it finished writing.
The new Eye-Fi Pro x2 solves both limitations by doubling the capacity again to 8GB and increasing the write speed to match Class 6 SDHC cards. It also adds 802.11n support and an “Endless Memory” feature which automatically deletes older photos that have been successfully transferred, so you never have to manually delete anything.
Like all Eye-Fi cards, setup is quick & easy. As soon as you insert the card, it will launch Eye-Fi Center and step you through the initial steps of adding a network and setting the upload destinations.
The Eye-Fi Pro X2 card is a perfect match for the D90. The 8GB capacity lets you shoot in raw mode and capture video without running out of space, and the enhanced speed lets you shoot in burst mode without overrunning it.