If QHY were to work on the camera drivers a bit more they would have a real winner. I find the drivers can be a bit problematic.
Having recently did the native SDK integration of the QHY SDK into NINA, I can say that there were some interesting bugs encountered in the course of doing that. HOWEVER, once I notified QHY of these issues, they were very quick to turn around fixes and, to-date, every issue I've raised with their team has been fixed. Eventually more recent versions of their SDK will find their way into apps and their ASCOM driver, if one uses that.
It seems that they're in the closing stages of rewriting parts of their SDK, I suppose to better-support non-Windows OSes (their SDK is now available in macOS, Linux (x86 and ARM), and Android favors.) Doing this while also releasing new hardware (and RPi3-based system) must be keeping their software team busy. That said, I do like these prices and I'd love to get a cam for myself, but I don't currently have the need for another one other than to use for testing NINA code.