Coming from vb3, it's been a long struggle deciding which way to upgrade my forums. Because I've been using it for such a long time (and at one time had 20 vb3 forums running) it also means been a little stuck in my ways.
I choose xenforo at least partially for the support - I haven't seen a development community like this since YaBB SE - everyone is generally friendly, and helpful - and unlike a certain other development forum, emails are answered in a more than timely manner.
Getting used to the admin and styling has been a pain, not least through a couple of misunderstandings, but I'm getting ready to import my big board to xf on Sunday, and expect my members will be happy with the decision.
I know there's a lot of focus on software and features, but I wanted to especially say thank you to the staff - and other board admins - who have been happy to provide great support so far.
Long may it continue, and I hope I settle in here - and become a part of that community help.