I think there are fellows among us that are scared of vB5 becomimg better than XenForo but don't want to admit it. I don't blame them. It's a natural reaction.
I read that vB5 is going to be XF's strongest competitor, but I don't think so, screw vB already. If you follow the development of Burning Board 4, you can tell that this software is going to be the strongest XF competitor. Unlike vB5 it is written from scratch just like XenForo, written in HTML5, has a built-in SEO just like XenForo,
copies a lot of things from XenForo, has a lot of features that are currently missing in XenForo and btw its predecessor was voted the best commercial forum software 2011. I honestly fear that I have to move to Burning Board 4 once it's released because I really like XenForo and don't want to move. But at the end of the day you want the very best for your community.
So please Kier, Mike and Ashley, I hope you step up and wipe the floor with Burning Board.