I really enjoy it! I like to call it Twitter on steroids!
There are even some celebs starting to use it. David Arquette posts on there often, and he is pretty entertaining! Carrot Top recently signed up as well. And Lucas Haas is on there, but he was one of the people who helped launch the app, so he BETTER be on it! lol! His mom is on there as well, and she is adorable!