One: Linux drivers that work with this card are extremely hard to come by. The only way you are going to make this card work under Linux is either by getting extremely lucky and finding some support or getting the rare linux distro that has the card supported by default.

Two: The GUI for the card that runs under windows is a horrible system hog, takes forever to get commands through, and keeps getting blocked by my firewall when it tries to contact microsoft.com. Shutdown the monitor program and all this goes away.

Three: The card itself is inefficient. Running at maximum power it still has horrible range. The maximum distance I got out of this card was 27.2m from the hub. In comparison, the other card I have (a Linksys USB 801b) gets a range of 52.1m.

In all, the only reason I would recommend this card is if you want to set up a hassle-free wireless network unders microsoft windows, and you don't mind sacrificing everything to expediency.

This card is missing an important feature - you can't set the WEP encryption key using a passphrase. Better brands will let you use ASCII text, (your dog's name or some other phrase) to generate the 64 or 128 bit key. Even with the new firmware, this card requires you to translate the passphrase into hexadecimal, and then type in a 26 digit number. Twice.
This is not fun, especially because the card often will not connect, and you will be typing this number in over and over.
Unless you are good at memorizing 26 digit hexadecimal numbers, buy something else.