While I will say that our Ubiquiti AP seems to work, configuring it was hell. It involved the management app installing its own nginx instance on my laptop, and then it makes a weird differentiation where if something's a guest network it asks what URL you want to redirect them to when they connect, but if it's not a guest network it doesn't have client isolation. (I eventually found the tickbox to enable it on a non-guest network, it had some weird Ubiquiti-specific name). It was just an ongoing series of problems.

I've been meaning to give out different DNS servers via DHCP on the guest network vs the internal but I just can't face trying to configure that thing again.

I'm glad you're happy with yours but replacing mine with Mikrotik kit is super high on my home-network todo list.