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Some if its many features are keystroke programming and fraction operations. Fractions can be entered in a very nice way, without the need of an extra key: by simply pressing the period (the . key) twice whilst entering a number. To enter 1/3 simply type "1..3". Also to enter 1 1/3 simply type "1.1.3".
This calculator as over 100 built-in scientific function and does algebraic math calculations as well.
A minus of this calculator is that even though the calculator does have menus it still has two shift keys and a rather crowded keyboard. A plus is the excellent design and sturdiness of the case.