Ok so let's get the obvious point out of the way ...
Yes it adds weight to your controller but in my honest opinion not in in a bad way.
So my feedback ..
I really thought I was not going to like this as I had gotten used to seeing the controller display and my thumbs on the controller sticks.
This very quickly became a none issue as everything you need to see is on the
crystalsky display.
The controller sticks and the rear programmable buttons are where they have always been so getting to these without seeing them is not an issue.
I did purchase the lanyard clip and lanyard and once adjusted to the correct length ( third battery ) it was smooth flying.
So all in all I give this five stars all round.
I am more than happy to recommend this to anyone.
And the only improvement I can see for this is maybe a way to reduce its weight ... but I do not think it is heavy in any way.