Rated 5 out of 5 stars
Very quick to install, though I must admit I was a bit disappointed in its basic look (the words "Not LibertyReserve.com" greyed out or "You're on LibertyReserve.com" flashing in green on bottom toolbar).
Just tested it on a phishing site though, and I'm much more impressed by the flashing skull and crossbones, and the fact it doesn't take you to the site instead stating: "LibertyGuard has detected that you are about to enter a phishing web site.
It is strongly recommended not to enter this phishing web site as it can contain viruses or ask you for your login information.
This is a fake web site created by hackers that wish to gain access to your money."
Nice, I don't remember McAfee SiteAdvisor doing anything like this.
Certainly well worth the install for Liberty Reserve users.
Overall: Basic look and feel (though this is a beta), but functionality is spot-on.