Two Questions:
How come you didn't wait until the "Gold" Version was released before converting?
How come there was no advanced warning stating a specific date for when you dropped the bomb?
Good questions.
1. Because vBulletin is a massive resource hog and the massive influx and cavalcade of visitors that will find their way here when Fable 3 is released will *possibly* kill the server. When Fable 2 came out, this site and every site in the network was down for 10 hours. I lost a lot of money because of that. It is unlikely, that even if we'd stuck with vBulletin it would happen again when Fable 3 is released as I'm currently paying what I consider to be a small fortune per month for the even-more-fancy dedicated server, but I didn't fancy taking the risk.
2. I was very much intending for it to a "Hi... we're going to install the new forum software in 7, 14 or however many days!", but the simple fact is that vBulletin is the cause for those brief occurrence of downtime. There are bugs with the software that have present for numerous releases and, if you had access to the licensed customer forums on vbulletin.com, you would see a slurry of unhappy customers and empty promises from the company behind vbulletin.
There may be a few bugs here and there at the moment, but they will be fixed. I love the new software; so much so that I bought five licenses.