I thought I had posted something on this quite a while ago.
I have not tried the site you suggest but I have been using ExpatShield for over 2 years now, when I am in Canada.
It does not work on MAC's but seems to be OK on Windows XP and 7.
If you expand to the "Full screen" it gets rid of all the advertising (they do have to get their money from somewhere). Occasionally it also seems to launch another window but I just close that.