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hyperkik - 9:47 pm on Mar 18, 2011 (gmt 0)
I switched to VB4 too early, and I encountered a FaceBook Connect issue with a second-most-recent upgrade (if that feature is important to you) and haven't checked to see if the most recent upgrade fixed it. But if you have the time to re-skin your forums and you've verified that the mods and add-ons you deem essential are available, at this point I would say "go for it".
My forum has a similar number of posts to yours, and a lot more members.