I have a few questions concerning the HDMI module for the controller.

             Has anybody installed the HDMI module for their controller?  
             How much do they cost?
             Are they as easy to install and activate as the advertisements show?
             Any special software configurations needed to use it?
             Can you use the HDMI output and still received all the video and data via the tablet/phone connected to the USB port?

Thank you,
Jeff

Jeff,
  Primary focus of HDMI upgrade is FPV googles or a secondary viewing via HDMI.
It can be purchased fro $99 (US) here or via a local reseller: http://store.dji.com/product/phantom-3-hdmi-output-module
There a wealth of videos -> http://www.bing.com/videos/searc ... ade&FORM=HDRSC3
The GO App recognizes the board when it's installed and gives you additional configurations automatically.
Yes the HDMI is a secondary feed and controllable within the GO App.