Adding my thoughts from being a Turris Omnia user since the release (2016).
I think it's one of the better standalone WiFi router/AP's out there. If you want a long term supported open source/openwrt one it might be the best choice out there.
The original 3.11 release track has been super stable for many years, and is still being updated with security fixes. The 4.0 branch was a bit bumpy ride but since the 5.0 release early last year I've had zero issues.
Note that the default WiFi chipset is not the latest generation, and although the dev team is actively looking at the possibility to get some wifi6 working [1], I think it might be a while before that is out and stable.
As a bonus it has some cool features like built in support for CZ.nic's honeypot as a service [2] and lxc.
