RPN was lovely because it was significantly faster to operate with. I remember showing up at math class having just received an HP-48G "because it's what the engineers use" and everyone else just got TI-89s because that's what the teacher had (TI gave teachers free TI-89s and did more marketing). The math teacher hosted an impromptu calculator speed contest and I beat out everyone else by a significant margin.
My dad has an HP-15C that I've always thought was cool but I never really liked to use it for anything. This new calculator is also really cool but I can't imagine ever owning one. I don't need to do much calculation anymore anyway so it's not like I need any calculator at all (hence giving away my old calc). I'm also usually at my PC, or a laptop, or I can ssh to my home system with my phone (if the phone's basic calc app is insufficient). For simple calculations I've most commonly used a Python repl since like 2007, but for anything more advanced these days I'd pull out one of the PC programs I was exposed to in the later parts of college (e.g. matlab or octave+symbolic and other packages, or maxima). But I also have used Python + libraries or Lisp + libraries, and would like to someday redo my Stats education with R. Hand calculators just seem really antiquated to me now.