Those guys are just AWSOME!!!
They find the best way, in my personal opinion, to analyze and test a web-site usability.
When i was at the univesrity we used to test our filthy web-site (if i could call it web-shitty-site), with camera, microphon & paper to analyse backwards the user ability to solve some simple or complex task
This software it's just amazing, you have a full range of information about the web viewer, his emotions and what his looking at.
For marketing and usability improving it's a kiss-ass tool!