If you have an IBM Thinkpad, it's great. If you have another brand machine, it's hit or miss. At this discounted (less than $2.50) price, if you don't have an IBM, it's definitely worth trying out to see if it does work. But don't buy in bulk until you're sure. And if it doesn;t work, give it to a friend who has an IBM as a gift. It's cheaper than buying them a beer, and it lasts longer!