Top three calculators ?

[HP67]

I agree with a lot of what you wrote. I love RPL because it is aligned with the way I write software generally. I like to build foundation pieces and build something on top of those. In practice, RPL is difficult and mistakes are very costly. I don't love it until something is perfect, but I still like it a lot more than keystroke programmables and it is certainly much more powerful for code I want to keep around forever.

That said, keystroke programmables really shine for one-off jobs. There is no stack-dancing, no hair-pulling and no groaning when you make a mistake. It's really easy to fix errors. I find I might write a keystroke program for a quick job where I wouldn't take the time to write it in RPL.

I don't have a DM42 or an HP 42S and I'm not really interested in either. If I had an HP 42S I probably would buy a DM42 and I still might some day just to have one. But I wish Swissmicros would just put out their 41L in the correct portrait format. That would be pretty much icing on the cake.