Indeed, great for speed and correctness. It also makes awesome use of a multiline display, even an extra 3 lines to see the stack is a game changer. Without R

Indeed, great for speed and correctness. It also makes awesome use of a multiline display, even an extra 3 lines to see the stack is a game changer. Without RPN I just use the extra area for graphing. It's especially useful for unit conversions, since with prefix you never see the intermediate values.