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I use one. I wanted to be able to shoot tethered with a 5D3 so I could check lighting, closed eyes, etc. Not to actually transfer high res files to a computer. I have a CF card in my 5D3 that gets the .CR2 files. The Eye-Fi gets medium jpegs that upload into a watched Lr folder. They load in about 6 seconds. It works great.
That's great to hear. I shoot a lot of sports, especially College Football, and I was thinking about using it to have photos go to the writer in the press box so if he wants to tweet a picture out or have an in game update while I'm shooting, we can.