No digitizer support - The program is capable of using digitizers and corresponding tablets which may drastically decrease efficiency. However, there are still some parts missing and I feel that an AutoCAD user trying to convert will have some hard times. The program will nevertheless be superb for a newcomer to CAD, and I think that the IntelliCAD sets the standard for future programs. A very low system requirement is also helpful for those designers who move a lot and need quick access to drawing while retaining most AutoCAD utilities. IntelliCAD can readily be used on a laptop.
Price is also an important factor.
I give Visio's IntelliCAD 98 four out of five Go Inside Review Lights.