Diligint.com - Track your visitors with heatmaps

"Diligint allows you to track your traffic in a completely different way. Each visitor to your site will be tracked as they scroll up and down your sales page. Where your traffic goes and how long they spend at any particular spot is recorded, compiled and displayed in an easy to read heatmap overlay. Statistics on how long your visitors stay or read a particular section and how far down your visitors scroll are also given to help you better understand how visitors are reacting to your site."

As a site owner it is important for you to understand your visitors and what it is they really respond to. They might be reading your sales page from top to bottom, they might be reading the first paragraph and leaving. Are people really reading your site and if so what parts are holding their attention. This is especially important if you are trying to make money with your site. Unlike other products Diligint is a simple set of php files that you upload to your site. You then insert one line of code into each page you want to track and that is it. No monthly fee. You can use on as many domains as you want.

Can they explain the concept more easily? Will tDiligint make this "track your visitor with heatmaps" concept take off?