Hello,
Just purchased vBulletin a bit ago! I've been using Invision board for a while, but I helped admin a vbulletin site once, then later found out my friend was totally legal with it (course now the site is gone and we aren't talking anymore). I totally love the ease of use on the admin side of vbulletin, versus invision.
I hope to have many questions to keep you all busy in the near future!