I purchased this calculator to use on my ASQ Certified Quality Technician exam and found out that it has some features that are very unexpected.  I love the stat menu and the functionality where you can enter the list of numbers and the calculator spits out everything from the standard deviation to the minimum and maximum value.  The only thing that is not automatically calculated is the mode of a series, but everything else is pretty user friendly and I have not seen an exam yet that excludes this model.