I don't know how everyone else feels, but tracking like this always creeps me out. I mean okay, there are good reasons to know what page someone is on and what they click to next, but having to track their mouse as well...that's going a bit far.

I add sites that use things like this to my "do not return ever" list.

In normal conditions, I agree with you. but if you see this tool as an ability to improve the UX, it's a miracle. I can't imagine a better way to find out design problems.