I own OP6, on Ubuntu Touch it has an annoying bug with shutdown (see my other reply here).
On mobile Linux, though, it’s quite close: camera is missing, GPS is a bit finicky about SIM card you use, I did not seriously test battery life yet. I plan to give it a proper try to daily drive it soon.
It would be a nice feature, if Phosh behaved a bit different in landscape mode; it wastes too much vertical space, especially using Firefox to browse the web is a disaster. Maybe the top and bottom panel should share screen space at the top instead (each half of the screen); or they should be on the sides instead…