"Works as claimed"4.0 starson by sunspot42x
Pros: Fairly easy to setup, uses your music players, glitch-free streaming
Cons: Transmits every noise your computer makes, silences your computer speakers, fidelity's not so hot
Summary: The best wireless music player out there for the money. No remote control or display, but you can get remotes for programs like iTunes elsewhere, or fashion your own wireless remote using a PDA if you want something truly powerful. I'm using this with a matching Linksys Wireless G router, and the signal is flawless - I haven't had a single dropout in over a dozen hours of playback to date. The fidelity doesn't seem to be the greatest over the analog outputs - haven't tried the digital connections yet.Updated
I've used the WMB54G extensively over the past month, and I've grown to enjoy it even more than I did originally. Connected its coaxial output to my harman/kardon receiver for clean, all-digital sound. It's played for hours through several parties at my house without a single glitch, apart from the one time Windows stuttered while burning a CD and streaming audio (can't blame Linksys for that). I've seen it on sale for $70 - at that price it's a steal, especially if your computer is in or near the room where your stereo resides and you don't really need a remote. Highly recommended.Updated
The WMB54G died over the weekend. My router lost contact with it (over an Ethernet cable, no less), and I couldn't make contact even when I connected it directly to my PC with an Ethernet cable.
I've replaced it with an Apple AirPort Express. The AirPort took about 15 minutest to setup, and so far it's working flawlessly. Better really, since I can select what audio I do and don't want to feed to it, both in iTunes as well as in media players like WinAmp and MediaMonkey, thanks to an output plugin that's freely available on the Internet.
Best of all, if I ever replace the AirPort Express with some other media streaming device, I can always use it as a wireless print server, or as a range expander, or as a base station when I'm on the road with a laptop. Costs a little more than the WMB54G, but should resist obsolescence much better.
This whole experience is one more reason why my next PC's gonna be a Mac. Apple more or less gets it. None of the other computer manufactures seem to have the slightest clue anymore.