 The big thing is you don't want to put this on your main device if you're worried about losing information or you're worried about maybe some of your apps not working the right way because it is a beta. You're not going to be able to say to your favorite app that you rely on to the developer, hey, this isn't working. What's wrong? They're going to say it's a beta version of the software, of the iPhone software, so we can't do anything about it yet.