I like that it's easy to setup, look good with other modules installed (like cms), very customizable which makes managing multiple forums easier than most others in this space have managed before them i think! The UI could definitely be improved if they took more time designing something new for their users rather then just adding things from what came out of another CMS platform? It was really hard at first setting up some custom fields but after reading through all tutorials/blogs we got there pretty quickly now so not much downside anymore :) We're using yaf as one part off our website infrastructure - allowing us easily manage content across many sites without having too complex code or needing huge teams behind each site / area within websites etc.