I have one. I use it when nothing else will do.
It is marginally uncomfortable, but requires three movements minimum to bring the gun into play.
It also took me six months to find a phone/clamp system that would work with my phone and my gun.
But, it hits 120 in the shade here in the summer. The only way I've found to carry a reasonable sized bore in that heat has been the Cell Pal (formerly known as pager pal).
I know that guy in the video. I bought my holster from him.
If it weren't such a PIA to make my phone/holster/gun combo work I'd probably rave about it.