In some of the reviews for other financial calculators the question is posed why the 12c remains so popular.  And this remains so despite the fact that the current iteration is a poorly with cheap materials in China.  The reasons are two fold.  First, the calculator gives you the essential functions you need in an elegantly set out format.  Take for instance the percentage change function, something that is commonly used on financial calculators.  The 12c has that function built into one of its keys whereas the new 30b has the function buried deep in a menu.  When you access the percentage menu with that calculator you have to know when to scroll down and when to scroll sideways.  Not intuitive and not possible to get a quick calculation.