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Ah gawd... I love these things. I had an HP32E back in 1980 which I absolutely adored. I loved the solid key tactility. RPN was a godsend in the 1980 HSC maths exam I remember which was, as a side note, the first HSC that allowed electronic calculators - as long as they weren't programmable. The teachers who scrutineered the exam weren't sure what RPN was, and were not happy to let me have mine.
I've been looking ever since for another one, but they're mostly junk off eBay nowadays. I much preferred the old LED display to the new-fangled LCD.
I still have my 12C, which I've had since they were introduced - and it's still on its original batteries. Incredible, because it's used daily.
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