I tried these and sent them back. Here's part of a review I found on Amazon.
"You need to make a big decision when you buy them, the developer version allows to side load apps BUT DOES NOT LET YOU MIRROR, the retail version lets you MIRROR but NOT side load apps, Although there might be a good reason behind this this should be advertised."
There is another option with the BT-200. I've got the BT-200 glasses and a Phantom 3 pro. I've got the HDMI-out module for my Phantom controller and I purchased the HDMI converter from Colorado Video. It's a little complicated, but you end up plugging the glasses into the Colorado Video converter and plugging the converter into your controller with an HDMI cable. I used double sticky velcro to mount the converter under my controller.
This gets me the direct HDMI output from the controller on my BT-200 glasses while still having the DJI Go app running on my smartphone. It's the best of both worlds!
I can give you more information if you need it. (i'm pretty sure I did a review of this stuff somewhere on the forum if you search for BT-200!)