I have got good familiarity with Pear OS 6, having used it for more than 6 months. I really liked the launcher (and felt it is much intuitive and better than Gnome 3 launcher), and the social networking apps like G+, Facebook and Twitter. Pear OS 6 is based on the long term version of Ubuntu - Precise Pangolin. The latest release of Pear OS, Pear OS 7 is on the other hand based on Ubuntu 12.10,