A well-regarded tipster claims to have heard that OnePlus has managed to amass 1 million reservations for units of its new flagship, the 7 Pro. These reservations could be made in China only in advance of the phone's launch. Therefore, it seems the latest pop-up selfie-cam device is very popular there.
https://www.notebookcheck.net/OnePlus-reportedly-scores-about-1-million-reservations-for-the-7-Pro-in-China.421141.0.html
The Pro is a respectable upgrade for the premium it commands, but indeed more people should be going for the non-Pro which is what's essentially a very cheap SD855 device.