You get integration with the Unifi UI and a much easier configuration experience, you lose only because what you've got is (probably) overkill for residential use. If you've got more than one AP then you start to win again because you can power all your APs from the switch.
If you were happy with your setup before hearing about the EdgeRouter, I hope you'll still be happy with it now :).
It looks like I'll be fine with the US-8-60W and the USG until I get an Internet (downstream) speed of > 100 megabits, which, in Australia, is not likely to happen for a long time.
I'd hope I'd have upgraded my LAN to at least 2.5 gigabit by then, anyway.
If you were happy with your setup before hearing about the EdgeRouter, I hope you'll still be happy with it now :).