This calculator is great. Although it doesn't have the functions of the higher end models you are still able to do everything needed to pass High School math and also most college courses. I have had this calculator for many years. I found it when I was on the bus and nobody claimed it so it could have been around for even longer then I have had it too. I drains batteries at a decent pace so recharable batteries are probably a good investment. It was a good graphing calculator in Physics and is good for calculus even though they want you to get a higher end model. I really enjoy the easy use as well. It is also programable to the ponint that you can put games on it and share them with other people. The calculator can also be hooked up to a computer to run graphical analysis if you have to make a graph. Top knotch Product from the standard in calculators.