The problem has been that I've been trying to write it so it will import everything and some of the things just don't port over that well. I've got it doing users, forums, and categories, have spent a fair amount of time trying to get forum/user permissions to carry over but I've had to redo this several times.
I may have to end up doing something a bit more basic to start like I did for the Eve importer and then expand from there. We're also going to look into making some type of import system that is more modular so instead of having to recreate it for each different product it will be easier to create new ones.
Sorry I don't have better news on this. Trying to balance time spent on it without pushing back the release cycle too much.