Home networking
I started having problems with my Netgear WGT624, and thought that switching to an Airport Extreme would be a good idea. I had some initial problems with it due to not setting it up correctly, and I was irritated about the lack of flexibility in available non-routable IP addresses. Both of these have turned out to be offset by the rock-solid behavior since I set it up correctly, and the speedy performance (and I don't even have N clients).
You won't read in the reviews (or the docs) that this router limits your choices for routable IP addresses. The non-routable IP addresses available for the internal part of your network are limited by the software; I'd been using 10.3.1.* with my NetGear, and had to redo my internal network to one of the available choices. This was not part of my plan for replacing the wireless router, and therefore I was quite annoyed for a while.
I also found more limited flexibility in connectivity than I was hoping for. There is a specific Ethernet port that on the router that you're supposed to use for your cable modem. I had arranged my network so that the cable modem was inside the central wiring closet for my house, and it was connected via an Ethernet switch to all of the ports on the LAN. When I plugged multiple Ethernet devices into the AirPort, ignoring the port for the Internet connection, I got random hangs every minute or so. When I plugged the cable modem directly into the AirPort, the random hangs went away. Now I've got a extra ugly box in a central room in my house that could have been elsewhere if the AirPort Extreme had a more flexible design.
Having said all this, I was hoping for higher reliability and greater ease of use when I decided to go with the AirPort Extreme. I got both of those, at the cost of flexibility that did matter to me. Now that I've adjusted my network configuration to work within the limits imposed by the AirPort Extreme, I'm greatly enjoying the product. If you're considering a wireless-N router and you don't need a great deal of flexibility in your network setup, I encourage you to consider this product.