I recently migrated my large 10+ yr old vBulletin installation over to xenForo. I wanted to share with the community my experience and reasons why I moved away from the platform. I also wanted to rule out any doubt about migrating from my the sluggish (vBulletin) platform. My Forum: http://www.zeropaid.com/forum/ Why I left vBulletin? Speed - I've never really been happy with the speed. The bigger my site got, vBulletin slowed down. Spam - This was one of the biggest reason I left. Spammer target vBulletin. Bloated - I'm not looking for a blogging software and vBulletin really wants to be one. Low user engagement - vBulletin lacks excitement. Migration Only issue was modifying the signatures column length to 'long text'. I as up and running in 3 hours without a major problem. Initial Setup Once I got all the data in and started poking around, I noticed the indexes were not created. Once I created the index, search started displaying results and I was able to browse messages from a particular user. 301'ing URLs - Once I figured out what I had to do, it was pretty easy to code. I'll give you a hint: the xf_import_log table. This table has all you need to write your URL rewrites. Just create an intermediary page. Addons I Liked Route Changer - I really like this addon, since I was already rewriting a bunch of the URLs I decided Separate Sticky and Normal Threads Thread Watchers [bd] Tag Me WDB Popular Content Style I haven't had a lot of time to dive into templates, but my initial assessment is it can handle what I need. I have modified several templates without a problem. In closing, I would recommend this software to anyone considering migrating from vBulletin.