I love this Add-On. Super simple interface, and it works every time (I've yet to have a single hiccup, or even a delay when connecting or disconnecting). On top of that, they actually provide a fairly long list of possible VPN server/locations for free (most "free" VPNs offer one or two, and make you pay to access the rest of the servers).

I just wish Hoxx would produce a "system-wide" VPN for the Mac OS, as it would likely be the best Freeware App available.