I run all Apple gear, including 2 Airpot Extremes and a Time Capsule. I'll use an Airport Express when I need a temporary connection to my stereo setup for iTunes.
I like it because it's very easy to setup w/ Apple's Airport Utility.
Apple, DLink, Netgear and Linksys all use similar Wifi chips (there's pretty much 3 companies) so they'll be very similar in terms of actual use, it's the GUI and extra features that might tip the favor to one or the other.
The new Apple ones (and some of the other vendors) now have simultaneous dual band. That means you can run 2.4 GHz and 5.8 GHz at the same time. That's cool because you can have one as your main wifi and another as a 'guest' link for people that want to use your wifi but keeps them off your internal network.
