I have had my fx-270W PLUS for 13 years now (also still on the original battery). It got me through earning my BSME from Georgia Tech and took a lot of abuse during school. Now, 7 years out of school, I still use this calculator on a regular basis. I really like how the calculator has a top line to show what you've entered, and that it has the ability to allow you to scroll back through your entry to make individual changes to mistakes. All of the scientific functions are available - trig, exponential, factorial, permutations, combinations, etc. It also has a memory allowing you to store multiple values for recall at a later time. If you are not looking for a graphing calculator but still need something powerful, this is the calculator for you. It has more features than I use!