I run vBulletin 3 on another site. It's nicer, but not so much so that I'd upgrade a properly operating vb2 forum that doesn't need the new features.
I've seen a few formerly successful forums falter because they upgraded the software and made everyone re-register. A lot of people didn't like the changes, were pissed about losing their accounts and post counts, didn't want to take the time to re-register, and never came back.
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