I have tried it. I like it better than Facebook, especially because of its commitment to privacy. The circles feature is great. I think most people don't friend their bosses, coworkers, and business acquaintances of Facebook because they don't want their personal lives to be exposed to those people. However, with Google+, you can friend everyone you know and only share your personal weekend drunken parties with your Friends (and maybe Family) circle.
It's still missing a few key features (it is in beta after all), like the ability to write on someone's wall or send them a private message, but for the most part, it's pretty nice. I am really, REALLY pulling for Google here, as I hate Facebook.
