I just installed and tested the software, nothing much to report other than yes, it works as advertised. Have to remember to change the USB mode to PC SHOOT in the XT1 settings menu, and that's about it. The connection seems pretty robust, switching the camera off disconnects, but switching back on reconnects immediately. Fire the camera from the onscreen button or the shutter release, either way your image appears in the Lightroom window pretty quickly. No live view.
There was no word from Fuji as to why the download link isn't working for Mac Users, all they did was very kindly send me the file, but the news on FujiRumors indicates the link will be fixed soon.
I should add these are the instructions from the installer, note that the images are saved only on the computer, not on the camera memory card:
Taking Pictures with Lightroom®.
Be sure to update the camera firmware to the latest version (in the case of the X-T1, version 3.11 or later), available from the following website: http://www.fujifilm.com/support/digital_cameras/
Select PC SHOOT AUTO. Select PC SHOOT AUTO for USB MODE in the camera SET-UP menu as described below. Do NOT connect the USB cable until this step is complete.
Connect the camera. Connect the camera to the computer using the USB cable and turn the camera on. Activate tethered shooting.
*The camera does not leave a image copy onto the memory card in the camera.