I have been Administrator at a few forums, I've used IPB, vBulletin, phpBB, and now MyBB. Taking the time to learn each of the softwares properly was very time consuming and was a very difficult task, but now I've settled down with MyBB and I don't think I'll ever move from it. It's definitely the easiest forum software to install and run on a day-to-day basis, and the plugin feature is amazing, it's so easy to install modifications compared to other forum softwares, phpBB in particular. I now officially love MyBB!