Why do you need this? I thought it was cool and got it for my 5D III, and it gave me "error 80"s about 1 out every 50 shots.
But again, why?
There are plenty of valid reasons to want a wireless download or a transfer to a tablet or to the internet immediately after a image is taken. Sometimes there is a person miles away waiting for your image. The eye-fi card is a budget way to do this, it just isn't working on a 7D.
The reason I want it is I would like to be able to monitor photos remotely, I take allot of photos of White Water Kayaking and Rafting, one one of the more impressive rapids where I live, there is a Wire going across. I am hoping to make a pulley system to lower my 7D Down, so I can get some better shots of the river, this has been done before by someone I know, BUT he found it very hard to get the camera in the right location, and with a eye-fi card I was hoping I would be able to see the pictures after they had been taken, and make adjustments where needed.
This is an example of a photo that has been taken before, this was taken after hundreds of attempts and allot of moving, pulling up and down etc. I would like to be able to do this quickly with out to much effort.

I would like to point out, that is unfortunately not my photo, and am not taking credit for it at all.