I just wanted to say thanks. I have now completed moving my community from SimpleMachinesForum to VanillaForums.
My users are extremely happy about the new Vanillaforums engine I have set up for them, and the community interacts much better than before. Also the data conversion with attachments went perfect, thanks to @x00 's "porterplus" http://vanillaforums.org/discussion/comment/167975/#Comment_167975 and enabling the fileupload plugin before conversion...
I did a thorough analysis of all the other contenders, using data from http://www.forum-software.org/, with MyBB being the other real competitor to VanillaForums in terms of awesomeness (actually testing 5-6 engines). I am happy to say that VanillaForums won and it's brought the fun back in my community
As an admin I love the fact that I don't have to sit around and "wait for features" because I feel that I have absolutely everything I need in an optimal way with VanillaForums.