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Also, important to note that a few months ago the forum was missing a few features, and I did prefer the old phpBB on the old jamroom.net.
But now that the features (search, my posts, etc) have been added in, I prefer the jrForum way of doing things. And having my own forum on my profile is a killer feature imo, nothing like that in phpBB.
I did a bunch of work on a VanillaForums integration back in the jr5 beta, it is possible (but you are right, not easy, and 2 skins to write and maintain). Once the jrForum module arrived though, it didn't seem worth the work - I wouldn't be able to make it anything better than the jrForum, and couldn't touch it's killer feature.
I really like the simplicity of jrForum (simplicity in use is what I liked about Vanilla as well). I think the simplicity will be THE key feature when it comes to building communities over the next few years: The less barriers to conversation the better.
Why not go with JR5 for your new community for a year or so, then compare your community results to your existing IPB sites, and then jump into the JR boat if your experience proves it to be the better option?
Brian said "Are there specific features missing from JR's forum that make it unusable for you? "If you could accurately describe the features from IPB which you think to be essential and which would improve jrForum - I'd be very interested in that too.