I realized halfway through my statistics course that my life would be so much easier with this calculator.  I didn't want to pay $100, though, since I only have 1 1/2 months left of the term.  I found a used on for half the price on Amazon, and it works just fine.  It has made my homework SOOOO much easier, worth every penny.  In case you are intimidated by using a graphing calculator - as I was - it is a lot simpler than I thought.  It helps that I have a program that explains how to use it.