I use a 5th generation Extreme at the head of an 80 client roaming network at my school. Not only is it functioning as a router, but also runs the APs (Express 2nd gens) semi-lightweight. That is a lot of strain and it handles fine.I have the Netgear R6300, which is an ac wifi router. It's worked pretty well (once a week I have to restart it).
How is the Airport Extreme? Is it worth purchasing over this router? Any downsides with the Airport Extreme thus far?