I like that you can have multiple versions of your model so it is easy for different people in my office to work with at once. It also has some nice features such as being able to see all views of models from any angle or perspective. The program sometimes freezes up when working on large projects. Sometimes the computer will just shut off without warning. This happens more often than not but does happen occasionally. If you need an excellent CAD drafting program this one is great! You won't be disappointed! We use it mostly for AutoCAD MEP drawings.