Yep, I'm testing with SMF.
Ran into several issues during the conversion, but I've got a working install of SMF running our boards data. The global statistics, like "Most users online", as well as the custom smileys have been lost. User settings have been lost.
But all of the data, image attachments, profiles, avatars, etc is still there. Incredibly the passwords system is still working. The passwords in the database are one-way encrypted, so SMF must use the same encryption scheme as our old IBF.
I have a lot more testing to do.
Now is the time to ask questions about what is and isn't in the new forum install.