I love this software because it allows me to do all my math problems in one place, instead of having to carry around three different books or paper notebooks with me at any given time. The program also comes with many useful tools that allow you to create your own custom functions. Some people may find the interface not very intuitive but once they get used to it, it's easy enough to use. It can be quite expensive if you don't have access to an academic computer (or even just a regular desktop)