This question revolves around whether or not you want or need to head out into the wild, wild web wilderness exposed. By “exposed” I mean letting anyone within 300-500 feet of your device peek at the wireless data packets floating through the airand seeing all your raw data, or revealing who and where you are, what you like and don’t like, or revealing your IP address if you decide to comment on a blog or news article.
http://robertsiciliano.com/blog/2013/04/30/to-vpn-or-not-to-vpn-that-is-the-question/