Not really looking for styling comments since I have little control over that.
We have a membership of over 70,000 members. While many don't use the forum, it is there for their private use as a member benefit. The main feature of the forum is a single sign on using our membership database.
When a person logs in on the home page, a username is automatically created in the xenforo if one did not exist. If a person changes their username in their profile section of the club membership page, xenforo uses that new username.
Permissions are also based on our membership database.
When a member logs in their permissions are automatically updated in xenforo.
If the person is no longer a member, they can no longer post.
We started with vBulletin and vBadvanced which was migrated to Drupal.
We could not use our vB posts since they did not import into Drupal.
To get to the point we are now, I updated our old vB3 forum to the last version.
Changed attachments and avatars from filesystem to database.
Removed all the hacks and mods. Created new forum sections in preparation for xenforo.
Then copy and paste each drupal comment into vB3 including timestamps.
Import into xenforo.
Hoping v1.1 doesn't break anything.