Agree - all working on my end, mores now I understand how the device works along IOS on my iMAC.
Key points for MAC users, with GE under options tell 'GE NOT TO KEEP RUNNING IN THE BACK GROUND', download Android File Transfer and install.
Once thats done and your finished with GE exit and launch Android the device will show up.
IT DOES WORK :-)
I also appreciate as a MTP device no eject procedure means worry and less issues when copying BETA files etc over to the device.
Hope this helps, please give me a yell if still confused.
Cheers,
CAM