The construction on this cell phone mount is pretty solid. The narrow mounting arm allows you to get it into tight spots, however, the extension could be about 1"-2" longer so it's not interfering with the center-mount display on the Juggernaut Classic Duo.
I was able to reposition the display slightly so that it all fit nicely, but things are pretty close together. In my setup I have a GoPro mount on the left side and the new cell phone mount on the right side of the display.
My iPhone doesn't seem to fit snugly in the grooves when the flip case is on, but it's tight when it's just the phone. If it was a thin case, you'd likely be able to get the phone in there with the case on it.
Nothing wrong with the mount itself - it's very solid, but the design limits the mounting location options if your handlebar real estate is limited.
Would recommend, but with the above caveats.