I am a teacher and I buy scientific calculators for my classes' use. This one has always been a favorite of mine. It is sturdy so many hyperactive fingers trying to pry off calculator buttons are not usually enough to mar it. The buttons also do not wear so ten years later, after many button presses, you can still read the button. The one con is that with the cover, it is too thick to fit in my caddy which holds sets of ten calculators each. But 30 years ago I used this calculator (or the one that is similar with a slightly different model number) and not only is it great still, but it has many features that others don't have. It has three memories, a stat feature which allows you to enter a list of numbers and get the mean, median, mode, standard deviation and other stuff.  Not quite enough for an AP Stat course but enough for a nice basic course which includes stats.  It has the usual trig and log functions, and they are entered "backwards" as many are, as sin30 is entered 30sin. This is a nice and relatively inexpensive and STURDY calculator.