BuddyPress.org

It works, we just switched from it to BP.

The main problem with WPU is the lack of updates. There is only one developer. You end up locked in and not able to upgrade WP or phpBB. When we switched to BP last month we where still having to use WP 2.5. Recent updates make things a little easier, but its the future that concerns me. Your site will depend on WPU and updates are rare and the developer has disappeared for months up to a year.

I don’t mean to bash someones hard work, I’m just telling you what I wished someone told me.