On a whim I bought the wireless xbox 360 bridge. I didn't really need it as I could use my pc and internet connection sharing to connect to the network in my house - although the guilt over the power usage nagged away at me!
My network consists of a Linksys BEFSR41 router (which is connected to my NTL cable modem) and a Linksys WAP54G wireless access point. You must also take into consideration that the house I live in was built in the mid 1800s. The significance of this is thick stone walls that obviously impede communication.
The WAP54G, for logistical reasons, is based upstairs. The room that I am currently in (due to my ususal one being re-decoarated) is downstairs. And yet I have played upon XBox Live without any real lag issues. And I should also mention that my Linksys USB network card struggles cannot gain a connection unless I place it outside the room.
I have seen that you can buy other wireless bridges - in fact I did have a Linksys WGA54G for my original XBox - but the beauty of the Wireless Bridge for the XBox 360 is a streamlined product that does not require an external power socket (unlike the WGA54G). The design is minimal and clean - apart from the ariel you wouldn't know it is there.
As for setting the device up, the XBox dashboard makes the whole process quite simple. Once I had added the MAC address of the bridge to the WAP54G permissions list and also set up the WEP key, that is.
So, in summary, this is a great device. Clean, unobtrusive design, and an uncomplicated set-up should sway your mind over and above the percieved (by some) high cost. As a friend of mine is fond of saying:
" You buy cheap, you buy twice"
This won't be a factor with the XBox 360 Wireless bridge.