I test their demo script on the site and it seems to work great. I figured I would share this and also ask for others to test the script out to see if there are any faults in it. I am running some tests on it right now and would like to see other's feedback before I try and impliment their script into any of my sites.
Well I realise this, but there seems to be a lot of cheating going on with top game site lists such as mine and one of them is able to filter votes that are made through proxies. They don't just claim to be able to, I have tested it to see if their scripts really do, and in fact the vote was not counted when I was using a proxy.
Also, there could be other uses for proxy detection besides blocking people.
Well that isn't very reliable either. I just tested it with a proxy in firefox and it didn't even show anything for HTTP_X_FORWARDED_FOR. Of course the proxy I am using is high anonymity, sot hat could be the problem.