[Blooded]

Upgrade vbulletin is very easy, you don't have to change anything just run the upgrade file and that's all, sometimes you don't even have to run an upgrade file just copy above the old files and that's it.

Sometime some mods don't work when you upgrade(to fix this is very easy too you just remove the hack and that's it) but this doesn't happens very often and when it does they release an upgrade version of that mod really quickly.

Vbulletin is 100 time more easy than phpbb, i tell you this couse i use phpbb smf and even ipb and the easiest forum to use is vbulletin.