Motion seconded on Unifi. I've just deployed these and they're so far a delight. The PoE (power-over-ethernet) support is great -- if you can get the ethernet cable to the AP's location, you're good. Allows for zero visible cable installations if you have the opportunity to do in-wall cabling.
I did spring for a "Unifi Cloud Key", which is just a small (pack of cards sized), dedicated host for running the Unifi Controller. Makes administration and updates a fair bit easier.
As someone else mentioned, they do require a wired ethernet connection, but the point of that is these are intended as (entry-level) enterprise hardware. Unifi vs. Amplifi is for contexts where 1) the administration overhead isn't a burden and 2) it's preferable to run cable and leave wifi bandwidth available for clients and/or the rich multiple network support (vs. mesh networking). Obviously, #1 means it's not intended for the general consumer market.
I wish they didn't do 24V PoE. I know they are coming from a WISP background, but a AP seems like something that should support 802.11af. It's not like it's something exotic.
Note that the Unifi AP AC Pro (which I'm using) are 802.3af/at (PoE/PoE+). The AC LR and AC Lite are indeed passive 24v. So there's that option within the line at least.
I have a Ubuquiti ERL3 with 2 AirPorts and a TimeCapsule. One I got them placed around the house in good spots I had no problems. I'm halfway hoping the Apple stuff will die or be outmoded soon so I can replace them with Ubiquiti Unifi Access Points. I have a Ubiquiti EdgeSwitch too and one of their cameras. Everything I've gotten from them has been rock-solid. The configuration isn't on an iOS app but the forums/community are great.
My office just upgraded to an ERL3 and Ubiquiti Unifi on my recommendation and there hasn't been a peep about internet problems since.
Ubiquiti Unifi APs each require an Ethernet connection. They do not form a mesh network. That's the whole point of amplifi, and this new Google wifi product
I too have bought a variety of high end consumer devices (for a small business), and they all crash or randomly drop out.
Disable wifi radio on router, plug in Unifi AP, solid connection.
They are annoying to configure, but have been so worth it.
Apple AirPort has also been rock solid.