I like that you can see what is going wrong with your website from an analytical point view rather than just looking at it yourself or getting some random person's opinion about where things could be improved! It would also help if there were more filters available so we don't have too many pages showing up as "redirect" when they are not actually being redirected but instead having their HTTP responses altered by our server configuration (or lack thereof).
We're trying out this tool now because other tools didn’t seem able do everything HeadMasters does well enough - especially considering how much traffic comes through each day via Google Analytics alone!!