I have used it. Well i purchased the package for one of my domains that i had developed.
The site it self wasn't that succesfull but i used to check with traffic blazer to see the incoming traffic and such.
I personally feel the whole thing is not worth it. Google Analytics gives you a far more visual and informative display of incoming traffic details.
I don't like it and as soon as i saw it when i logged in i knew it wasn't worth my money.
Does it give you the information you need? Yeah sure it does but the whole presentation is sucks and there are free substitutes for this kind of analytic services/packages.
I would advise to apply for a Google Analytics code to get this kind of information. better organised and much more appealing wich in result gives you more joy to view your traffic stats.