While I tapped "love it" on here, I did so with some reservations...
Initially I set the WET54G up with to connect my Mac Mini to my wireless network - I figured it was cheaper than an Airport. It isn't really, but I can add this and I can't install my own Airport. Anyway, I had a bit of difficulty setting it up, but finally got it working okay.
About a month later, I switched my computers around and added the WET54G to my Mac Cube. Lo and behold, the setup (even after factory resetting everything) was easy as pie and worked perfectly. So maybe I did something wrong the first time - I don't know.