I required wireless connectivity for my computer and my old adapter performance range was terrible. I bought a USB WiFi Adapter which supported up to Wireless-N. For a device under $10, it showed full connection as opposed to my old Linksys WUSB54G where the connection varied from 0 to 1 bar.
As for the adapter itself, It works great to add wireless connectivity to your computer or if you are looking to get an upgrade from Wireless G. It’s a compact design, smaller than even a thumbdrive and comes with a detachable antenna to improve signal strength. It uses a Ralink 5370 chipset which has been identified to work with the Raspberry Pi and also likely to work with the upcoming ODROID-U as well, but not proven yet. The RT5370 is a cost-effective, highly integrated USB Wi-Fi single chip containing an 802.11n MAC and can support various encryption modes such as WEP/WPA/WPA2.
One issue though is that in Windows, there weren’t drivers available for auto-installation and I had to use the drivers on the CD. Since CD/DVD drives are now less common on computers, I have provided an alternate source for the Ralink RT5370 802.11N WLAN drivers here. The drivers are for the Ralink 5370 USB WiFi adapter, and for Linux, Windows and MAC.