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I'm sick of phpBB. I don't have anything against it but I'm just sick of visiting forums to see that they're all running on phpBB2 (aarrg). Now, newbb is clean, fast, scalable and it works perfectly with Xoops, so why change it with some crippled, poorly-implemented board?
The Invision board on the other hand is much nicer but I've seen many people complaining about problems they were having with it. My suggestion is, just wait for something new, otherwise stick with newbb...