I came across this colour management review of the Spyder2. Has anyone used it before? What are your thoughts?

I have also heard some people say that you can calibrate your monitor using the software that came with it... in this case its free.

So I'm wondering what are the differences between the $199 (or whatever other price) software and the free software?

Is it easier to use? Is it more accurate (by how much?) Does the colour stay good for longer? etcetc...