While I still need to drop $180 to get an AirPort Extreme Base Station for 'review' from Apple, Engadget just put theirs through its paces. Overall, they found that the obvious upsides were Apple's sleek design and easy-breezy setup thanks to the revamped AirPort Admin Utility 5.0. In the drawbacks category, however, were a bizarre lack - in fact a back-step for the AirPort base station - of gigabit ethernet, and less-than-optimal transfer rates, though Engadget concedes your mileage may vary, as it so often does with wireless hardware.
Engadget has also posted a hands-on gallery, which includes their own screenshots of the new Admin Utility. Strangely, they didn't say anything about some of this base station's new found abilities, such as the new AirPort Disk, one of the key features making me count my pennies in anticipation of affording one of these.