This calculator is great. You can type in long formulas and can check to see if you typed it right since it comes on the top line. This calculator has all the functions you may need to use in school or at work. It also comes with a one year warranty. It is also reliable that this calculator runs with both solar and battery power. One tiny problem that can be overlooked but must be pointed out is this calculator has on off button. I have this calculator and the fx991w they both are great. I defenitly recomaend them over other calculators in the same price range.