The screen was purchased in November 2020. I intentionally waited some time before evaluating it (6/7/2021).
The positives:
Coming from the very good but outdated Dell U2312HM, I have to say that the M27Q is day and night compared to the old one.
Apart from the clarity offered by the higher resolution (but also slightly higher ppi), what amazed me was the brightness and vibrancy of the colors. Without the image being oversaturated.
The other feature that really makes a huge difference in the user experience is the 170Hz. Even in the operating system environment, the feeling is different. I see the image and the movement of the mouse pointer on the Dell, which I kept as a second monitor in portrait mode for code, and it looks terrible now.
The stand is very good with height and angle adjustments and has 2 HDMI ports, one Displayport, and a USB3 hub.
Finally, it has KVM for those who have USB Type-C, which is very convenient for those who work on 2 computers.
Overall, the image is very good and uniform, the viewing angles are excellent, and you enjoy staring at it.
If I can find any negatives, it is that the infamous ips glow appears slightly in the lower corners. Nothing that bothers. Only in very dark scenes will you notice it, and even then, only at an angle.
The other thing, if one can call it negative at this price, is that the HDR advertised for the screen is not even close. Generally, you always have to look at what HDR each monitor manufacturer claims to have. From HDR600 and above, it makes sense. HDR400, which also applies to the M27Q, is NOT HDR. Any monitor with decent contrast can achieve this performance.
In any case, the screen is the best value for money. IPS, 27" and 170Hz at €348, which is what I found it for at the time, I think it's a bargain.