I suppose the thinking is that if you are downloading images, you don't need internal memory in the card (maybe a small buffer), I like so save images on my eye-fi mobi pro as well as upload them. Occasionally, a upload goes wrong, and I have to pull the image from the card. The other thing about the eye-fi is that it does not care which camera or brand I put it in, it just works, even if its not a specifically eye-fi enabled camera. CF adapters are available too.
I doubt if the range is going to be very good, my eye-fi is fast to about 30 ft when going thru a wall, or a bit further with no obstructions. Of course, it will reach much further than that, but transfers become very slow over 50 ft. I really doubt that this one will reach any further, its at a disadvantage inside a card slot.