I went for the Ubiquiti stuff because it seemed like it would be fairly easy to configure and it was... and I don't have a lot of experience with configuring routers/firewalls. Ubiquiti's stuff was also less expensive than some Cisco gear I was looking at, though that may be more because of my location (Poland) than anything else. Also, because I'm in Poland, houses are constructed largely out of brick, concrete, and rebar. So, reasonably powerful AP's were needed and the U6-LR's seem to fit the bill.
My only issue with the Ubiquiti stuff is that everyone admonishes everyone else to not automatically upgrade due to some pretty serious issues from firmware upgrades from Ubiquiti in the past. However, because someone will always have issues with an upgrade, it can be hard to know for sure if the latest firmware is going cause real issues or not.
We have 4 access points.
In summer we move an access point from the kitchen to the woodshed (with a powerline internet adapter). Tablets work in the kitchen but it would be ideal if we added one more access point to the bedroom above the kitchen.
It's no accident that Apple is not making a WiFi access point because "just works" is an impossibility. If you believe in the apple aesthetic you probably also feel entitled to install your access point at whatever corner of the house your cable box is installed, despite what physics has to say about it.
The awful truth is that different WiFi chipsets are just barely compatible with each other, high-end access points are chock full of workarounds for flaws in WiFi clients, and companies like Cisco and Ubiquiti have lots of patents on those workarounds. They have a "mutual assured destruction" policy that they don't sue each other, but they make sure that routers from companies like ASUS work only occasionally.
Powerline internet adapters are your friends. Their weakness, relative to modern switched ethernet, is that all the devices share a common bus. For best performance, use just two powerline adapters to make a "point-to-point" link to support one far-flung location.