I've used it. I'm not sure how anonymous it actually works. I'm a little uneasy about these programs as your IP goes through a main server to mask your IP to someone else's. I wondered whose IP's were being masked and why, and if they had any knowledge of this, and are these legit IP's your being masked with. My guess is if your surfing websites were they can't trace your IP, or at the very least determine the type of OS or browser your using. There has been some queston brought up with another IP masking software called "Stealther" http://www.photono-software.de/Stealther/ that has been said to be 3rd party spywar? I can't confirm this however.