If you haven’t caught EngadgetHD’s Vista Extender shootout, it is well worth the read. Ben took the three extenders available on the market today and put them through a few rounds of rigorous testing. As we have come to know, the Linksys and the D-Link make good extenders but lack the cool animated transitions that the Xbox360 is capable of. What it boils down to, is if you can keep a 360 in a cabinet to reduce fan noise, it is the way to go.
A whole other subject is the limitation of extenders today. When trying to make the switch to an extender based system, I found the lack of file support extremely frustrating. I am rather surprised that the hardware has taken so long to catch up.