I still have my HP-41CX that I got for high school graduation in the 80s. (I won't say exactly when during the 80s, so I can feel a few years more youthful.) It still works absolutely perfectly and is a true pleasure to use. The action of the buttons is still unmatched by any competitors and notably superior to all current TI calculators. Even the case is superior: durable but soft exterior, false bottom with extra padding, YKK zipper that will probably work for a century after I am dead. Even the rubber feet on the bottom are of superior quality: four really sizable feet that haven't worn at all after decades, and they obviously chose a good adhesive because they haven't fallen off, either. This calculator proves the famous Ben Franklin quote:

"The bitterness of poor quality remains long after the sweetness of low price is forgotten."