Group;

I just recently found this link. Check out the closing statements on the last page about Revits limitations.

http://www.gsd.harvard.edu/users/lburdi/databases/revit_formz/elements.htm

When importing a drawing from Autocad (.dwg or .dxf) Revit treats it as a block. If we explode it we loose some of the original data (layers, colors, etc.)Also, some of the 3d objects can not be exploded. On the other hand, when exporting to .dwg or .dxf we can save layer information.The imported drawing is a block that has lost its parametric ability. The fact that the user can not add new parameters limits radically the use of the import command. Actually the software does not support any user-defined commands (Macros) and does not have a full programming language.Additional limitations of the software: - We can not change a corner of two walls into a curved one (like the "fillet" command in Autocad).- We can not define a dormer window.- We can not extrude a solid by linking the sides of the top and the bottom polygon ("blend" command) if the polygons are not of the same shape.- We can import only .gif and .bmp images, which are view dependent and can be placed only in 2D views. In general, Revit is not a software for complex modeling. This means that it has serious limitations in modeling things other than the "normal" objects that someone would expect to find in a builing. For example it would have been impossible to handle a building like the Gehry's Gugenheim Museum in Bilbao with Revit. Also, the fact that the user can not customize it and can not have access to a programming language or build macros limits its functionality and capabilities.Some limitations of the software...