Web site visitor tracking with "Clicky"

Has anyone tried a free Web visitor statistics program called Clicky?

It's a free program that you can use on your Web site to get detailed information about your Web site visitors. For example, which keywords they used to find your Web site and which keywords led to bookings. It also shows a world map with all of your recent visitors marked on it.

To install it, just sign up and then copy and paste the code they give you into every page on your Web site.

This is the Web site:
http://getclicky.com/