I bought one and got it two days after Christmas. For the most part it works great. No longer do I have to remember or type in all those Usernames and Passwords. Its great for logging onto Windows XP. Right now I have myself and a Guest setup. Just put your finger on the sensor, and you're in.
On one website (my bank) the "Replace Password" thing doesn't work. When you drag the word(s) over to the login boxes, they won't go in. I tried it with Netscape and you could get the words to go into the login boxes. However when I went to the website (using Netscape rather than Explorer), and put my finger on the U.are.U, the password would get pushed into the Username box along with the Username. So I still have to do it manually for that website.
Also on another website the auto "Return" function didn't work. It would cause an incorrect login. When I didn't use it, the info would be dumped into the boxes, but I would manually have to click the login button.
So there must be a few websites that it isn't going to work with.
For the most part, its great. I highly recommend it.