After over a year of experience, I'm finding that Apple's solutions, while user-friendly, aren't very robust. An annoying recent evolution illustrates.
I have a 4-computer network in my house, supported by an Airport Extreme base station, and 2 Airport Express units. The latter are connected to 2 stereos.
The Airport Extreme base station is a new acquisition, replacing an original Airport bs. As soon as I added the new base station, performance degraded, even though I also added a Dr. Bott's Omni antenna.
I just upgraded my desktop computer from a G4 with Airport to a G5 with Airport Express. The signal I now get on my desktop is about half as strong as on my 802.11b equipped G4.
I get frequent audio drops on the Airport Express units.
I'm pretty frustrated, and moved to the non-constructive reflection that Apple's wireless products bite the big one.