Ahh thank you Michael.
For some reason I'd been avoiding OBJ format due to earlier problems (Maya had some odd "features" when importing obj before, like "don't cast shadows and visible in reflections randomly being turned off on import).
I'd also got it into my head that obj import in Maya didn't load or respect user normals, which MOI outputs SO nicely. I was wrong, the obj output from MOI is superb :)