We made the jump to VB4.0 after it was released and it has been pretty much all down hill from there. I thought we would use the blogs and CMS more than we really did. We had 2 active blogs and about 5 total blogs. Our CMS was more of a portal/landing page that most people didn't even know we used for news and such. Then VB just turned into VBloat with tons of bells and whistles that I didn't use and didn't want installed.
August 1st I finally did the cutover to Xenforo. Slowly but surely I am getting everything up and running and dialed in. Currently we are just using some of the free styles from here, but in the future I plan on doing up a couple of custom themes to give the site our own feel. We did the cutover at 600k+ posts and 2600+ users. Not one problem with the VB to XF import.
I am looking for things that people like/don't like or ideas to help improve the overall feel of the site. So far the only things that I have really done is add a couple of theme options and a couple of extra add-ons (tapatalk, widget framwork, donations, seperate stickie/normal). Next up will getting a custom page setup for our supporting vendors/dealers.
Thanks for all feedback.