When I first saw this plugin, I instantly saw the value. I mean instantly. Social Signals and user ratings are what's going to drive your blog into the stratosphere when it comes to Google.
After testing this free version on a few low traffic sites, I was convinced and upgraded to the Pro for a few bucks. It was well worth it too.
That said, this free version is certainly more than enough for the beginner to get their feet wet with rich snippets. This is A MUST HAVE plugin so go take the plunge right now.