Excellent
Ordered to replace my old Raspberry PI 1 which was running out of steam.
No problems directly related to the Raspberry. However, the use of a microSD card caused me a problem: badly inserted in the raspberry's slot, it slipped out of my hands and went inside the case..... I had to dismantle everything to recover it.
As far as performance is concerned, I didn't test the dual screen, nor the 4K, but the 1980p videos and the Linux desktops have an excellent rendering.
The 2GB is enough to run everything (raspbian and KODI). The performance of the 4 core processor is much better than my old PI1 (1 core), it's night and day.
I use POE with a splitter (not the HAT POE) and no problem.
I'm not sure if it's easy to implement, but it really lacks a real switch to cut/restore the power, or at least a reset.
Indeed, when you shut down the system (recommended to avoid corrupting the SD card by an electrical shutdown), there is no other way to restart it than to unplug/plug the power supply (which is not good for the connector, in the long run).