XF 1.4 Transferring forums

If I transfer from vanilla to another, compatible forum and then to xenforo will my users threads and posts be transferred? If so, how? Does it transfer the categories in order and create the who forum that I had before with users profiles all set up so they don't experience too much confusion or lose of content?
That's wonderful news because they are still posting away on the old site and I have so much to learn about Xenforo before I can move them into our new home :)

Thank you so much Brogan :)