Just testing a U6 Mesh and boy is that thing tiny but packs a punch as a new AP to take over from the BT hubs wifi which we've found to be positively rubbish of late. Got a PoE switch arriving later this week to power it but it's nice that it comes with a PoE injector to get you started if needed.
The unifi server and its dashboard which I'm just running when required on my PC an is great (not having used anything like this before!) plus the app is handy when I've got the server running.
Went from 76Mbps wifi speeds on the BT hub to a nigh on full 500Mbps of our FTTP connection - can't say fairer than that!