General rate: Negative
Using this software will do more harm than good. All of the techniques it employs can be circumvented with little difficulty, and most of them will harm your website by making it inaccessible to search engines and a substantial proportion of regular visitors. In short, a complete waste of money. More information appears to be available at http://lachy.id.au/blogs/nettwits/2004/07/false-sense-of-security