Slavik successfully completed a vBulletin to Xenforo migration for me yesterday. My forum (
http://forums.civfanatics.com) has 250K members and 14 million posts.
My forum was running on vBulletin 3.8.x with third party addons DownloadsII, vbGallery, vbDrupal, and vbLinks Directory. During the planning stage we decided to exclude vbDrupal and Links from the migration as those need custom development.
We started the migration last Friday, and the migration completed on Saturday for the main forum and the gallery. We re-opened the forum on Saturday night.
The part that took longer to convert was the DownloadsII, due to the importer for that addon was written for the older version of the Resources manager. Slavik had to make some updates to that process. DownloadsII were successfully converted yesterday.
This migration really inject new life to my community as the software was too old. There were also security concerns and compatibility issues with latest version of PHP.
If you are on the same boat I was in, wanting to upgrade to newer forum software but are hesitant due to the installations of third party addons, I highly recommend hiring Slavik to do the work. His experience from doing so many big forum migrations is reassuring and can ensure your migration is successful. The price he charges is very reasonable as well.
Reaching out to Slavik and get his help to do the migration is a great decision. I only wished I had reach out to him earlier.
Many thanks for all your help, Slavik!