I have a Mobi Pro 32Gb one and failed to get that to work out of the box. Eyefi Support sent me another from the US which arrived today and again, that won't work out of the box.
The network the card is supposed to generate is not seen by my iMac, my iPhone or my Surface Pro 4. No images transfer between the camera and any of them, despite the card being correctly set up according to the user manual.
I have sent another card log to Support but wondered if anyone here had ever experienced a working one?!