It was flaky as hell when it first came out but over the course of about a month of receiving it, the problems largely seemed to stop occurring.
I typically unplug and plug it in once per day when I take my Macbook Pro away to sit somewhere else in the evening. But when I'm working during the day I use it as my primary display. For my own experience the integration of brightness and volume is seamless. The speakers are good (although I use some old Genelec monitors instead for this), and the quality of the display is absolutely fantastic as you said.
About one in fifty times plugging it in to the laptop doesn't immediately work, and then I plug it into a different USB-C port on the laptop, and then it does.
Despite this I'm very happy with it.
This is reproducible by connecting both screens to a 15" MBP Pro 2016.
If the screens would at least have an ordinary power switch so I would have to crawl over my desk once every two weeks my life would be a lot better,...
They were like: LG does this now.