BIMx is an amazing, fantastic, and mind-bending tool for anyone in Construction. It has become one of our most loved features of ArchiCAD.
I have a suggestion though, the cutline on the 3D model is always orange. Although this is visually very appealing; a setting to change it to show the materials would be highly appreciated. When the contractor can pull a section through any part of the building and see all the materials (like a section in the plan), it will bring this App to another level.
I have attached two pictures just to highlight my point a bit better, the orange cutline vs the Element Information (Materials).