Rating: - Well it Works... DEFINITELY not worth the price
First of all, I want to point out that I've used multiple devices to try and get a good connection between my WPN824 Netgear Router and my XBOX 360

Logitech Play Link - Works PERFECTLY, easiest to set up, online gaming is flawless but downloads were WAYYY too slow (hours and hours to download)

Netgear HDX101 Powerline Adapters - Didn't work at all, absolutely terrible performance, barely worked in the same room

Xbox 360 Wireless Adapter - The main reason for this review, it is the nicest looking of the ones I used/took up the least amount of space. However, I got it to stream HD off of my laptop. Even when the two were in the same room in clear view of the router, I never could get more than 2 out of 10 bars for the Media Center Performance test. I was frequenstly disconnected for NO reasons, yeah it worked but didn't do what I bought it for.

My solution? The Belkin Wireless Range Extender F5D7132. I picked it up used on Craigslist for 16 Dollars SHIPPED.
The setup was not the easiest, gotta follow the instruction in some amazon reviews if you use WEP security, but once it is set up it works AMAZING.
A. It extends your wireless, so now my router is on the other side of our 4,500 sq. ft house and on the first floor, this extender is on the 3rd floor in my room, extending the internet to my laptop.
B. You can hard-wire anything (XBOX 360) via ethernet into it's LAN port, making the connection to my laptop securely in the "Acceptable Range" for streaming HD. Now the XBOX is hard-wired, I have increased my wireless rnage significantly, and I paid 16 dollars.

Point being, SKIP THE MICROSOFT WIRELESS ADAPTER, pick up the Belkin Extender, does more, costs wayyyyyy less, WORKS!