I am blown away by the iPad tethering and how well the mobile app works. It's really impressive.Phocus IMHO has been improved a good deal in the last few years.
I have no feelings for or against it, though. I just use it because I have had HB cameras. If I had P1, I’d use C1.
The best thing about Phocus is that’s it’s a free download with no paid upgrades. iPad Pro tethering is also pretty slick with the X1DII/CFVII.
The desktop app (at least the Mac version) is just there.. it works for tethered capture just fine and gets me my files on a monitor and hard disk. Then I just send them to my editing server and work with them in Lightroom and that's the end of Phocus.