Funny thing is it used to support .obj format upto (i think) version 9 then they dropped it! I hate to admit it but i think Revit from what i can see looks to be leaving archicad behind and im not sure what archicad can do as it is based on older code which clearly doesnt handle nurbs or any of the more modern modelling solutions. Our office is looking to get a seat of revit to give it a spin. Im looking forward to seing what it can do and would be looking forward to it even more if it want an autodesk product these days!