Eh. I have a mild preference for RPN calculators over infix ones, just because it makes it a little easier to keep track of what I'm entering on calculators whose displays are just one row of seven-segment numerals. On computers or on nicer calculators I couldn't care less. I'm equally comfortable with prefix, infix, and postfix and can easily transpose between notations in my head.
hp 12c w/rpn = best finance calc ever
too bad i only know how to use 1/2 of it's functionality.