They work EVERYWHERE except through some very rare buggy anti-viruses and ISP implementations. Real life stats: "759 out of 205.875 customers refunded because

They work EVERYWHERE except through some very rare buggy anti-viruses and ISP implementations. Real life stats: "759 out of 205.875 customers refunded because their antivirus blocks the pull HTTP stream", so 99.7%! They even go through the great firewall without bureaucracy.