Robert Swinney wrote:
I think it is more efficient for many calculations, if you can keep
track of what's on the stack. It's also fun when some engineer
borrows it at a meeting and can't figure out how to multiply two
numbers.

My point exactly. The engineer is unable to re-learn his math under
pressure (and he is math trained). So, the ordinary mortal is in for
a ton of confusion if he tries to figure out RPN. True, it makes
lots of folks break arms patting themselves on their backs over how
smart they are - but - the fact remains, RPN was introduced because
of electronic limitations of the time. Sphero explained it very well
when he said that AE takes more interim memory.

Bob Swinney

I don't think it's confusing once you've learned it, and it has the added
benefit of stack manipulation. You don't have to save interim results in
memory, you can easily transpose results when needed, and certain operations
seem more meaningful and logical. I've had quite a few HP calculators and
TI's, I always liked the HP's.