This is a great pack. The case is of good quality and fits well for the controller. There are even small pockets for the cables etc.
The only downside I've seen so far is that there is no room for the mount in the case. I can see why though, it would make the case slot bigger.
The mount fits the controller very well and it's really sturdy. There is an arm to adjust how far from your controller the phone sits and then there is a ball mount so that you can twist and turn your phone in any direction. For me this has been working really well since I realized I wasn't always holding the controller straight. Also do note that if your phone has buttons in the middle (like the volume buttons on my Pixel 4) you'll have to mount the phone alittle to the side.