Having used a Ti84+ and Casio FX83GT for my secondary education, and borrowing a HP32 from a classmate at university I really like the stack approach and rpn so I caved with a HP35s which mostly did the job but wasn't pocketable and a bit clumsy for me I found a HP32sii and snapped it up becoming my daily driver for a long time. It scratched an itch i didn't know i had, then wanting to expand my programming and plotting I didnt like the look of the 49g and the 50g being out of my budget I found a nice HP48G that sits on my desk for the more complex work where the RPL hits the needs as well as a "quick" plotter. Even managed to bond with the older grumpy engineers over the calculators and rpn. Im sure my collection will continue to grow.
Those are some absolutely gorgeous calculators! It's the one rabbit hole that I have yet to explore. I have Free42 installed on my phone and I've been trying to learn RPN, but I'm reluctant to pick up a piece of history that I can't use yet while knowing that someone else can instantly give it a good home.
Ive also been using droid48 on my phone as well as free42. The transition to RPN can take a bit kf getting used to, HP used to have a guide to RPN in all the user guides. Take your time they are great pieces of hardware regardless. Its really funny handing it to someone and they panic because its different on the bright side people dont ask to borrow them.
I work from home and my wife won't touch anything with more than a square root button, so that's a problem I don't need solved :) Learning RPN has been on my to-do list for an embarrassingly long time, though.