I don't have an official review for you, but I have worked with a lot of router products, LinkSys, NetGear, DLink, SonicWall, Cisco, and the Airport Extreme is an amazing product. What you have come and would expect from Apple high quality products that are easy to use, but if you want, have to power to really configure/tweak the crap out of them.
Nice Features
Static IP Assigns via Mac
Backup The Entire Config/Settings
Run Both 802.11a/n + 802.11 b/g/n simultaneously
Open Ports For Certain IPS
Over WAN Config
Would Like To See/Missing
Firewall SPI (Stateful Packet Inspection)