I'm using an U6+ with OpenWRT on it, flashed straight after unboxing and it's the only thing serving wireless in my household

It's alright except for some shenanigans with DHCP trying to compete with the router, I fixed that by just disabling DHCP on the AP if I recall correctly.

Speeds are pretty much as advertised on the box, the main thing using wireless is the TV as it has a 100mbit LAN port and it it's always smooth sailing. VLAN-separated SSIDs work great as well.