When I was at uni I had a HP42. Awesome calculator - fast, and you hit the buttons and you know they were hit and registered. Click.
Started work (structural engineer), decided to "upgrade" to a HP48. Nice clicky buttons, but bit slower.
Office fire, insurance money and I bought the latest HP49. Woeful. hit buttons doing fast calcs and they weren't registering, the nice click feel gone. Horrible.
Recently cracked it and bought the new HP35s. Nice clicky feel is back, pretty fast, but sometimes the buttons don't seem to register. Just slows things down when you're not 100% confident that because you felt a click, it registered.
Oh for my original HP42 back again... it was all downhill after that beauty.
I know the HP41 is a bit of a cult classic too.
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