I was extremely close to finishing the upgrade to vB4 until someone mentioned xenForo. Very happy and well worth the fact that I scrapped a few months of previous work and started fresh with xenForo. The hardest part (besides months of working on the style) was removing the vB mods (which were often unsupported) and converting that data to standard functionality so that the xenForo migrator will work smoothly and keep the data I need.
First time designed a xenForo (or any other) forum style so I am sure you can find more than one thing wrong... . So please, feel free to offer your thoughts and suggestion. Since its still and always a work in progress, I may definitely apply them
BTW, to make it easier for members to transition and learn the new features, I created a thread with most of the user end featured from the HYS thread