When move to Xenforo I have bought some paid addons, include:
TAC(Tenants Anti-Spam Collection) - Anti-Spam Complete Collection
XenCentral Multisite System
Social Connect (for Facebook and Twitter)
XenScripts WordPress to XenForo Bridge
[bd] Social Share
However, some addons become useless such as Social Connect and Xenscripts because no further development. When stop using Xenscripts I also had to drop integration with Wordpress. This make me wasting a lot of time and could not focus on building content for my site. Site traffic also decreased so much.
Now, I think I should stop upgrading my site software about one year to save time for building content. I like Xenforo default style but some people says it's necessary to have a paid style for site. So should I buy one?