I bought this calculator for my MBA Finance classes for $28. I had the $16 TI 30X IIS before which is using the same casing as the BAII . I don't understand why the Business Analyst II is so much more expensive, it doesn't show a history of calculations and no solar cells on there. The calculator did the thing it had to do and it's relatively compact, but the TI 30X IIS gives you so much more value for your money. Once you learn some simple formulas by heart, there is no need for the special "financial features" of this BA II .