HMA was a triumph of marketing and usability over security concerns. They are one of the most law-friendly VPN providers out there (and it couldn't be otherwise, considering they hail from a certain GCHQ-ruled island), but they were great at selling a simple way to avoid boring office-network blocks. I remember using their web proxy to bypass some stupid block on the FreakAngels webcomic (to this day, I still can't understand why anyone would block such innocuous material).