When I was in school 25 years ago I salivated after the HP-15C calculator but never had the money to buy it. I used a programmable Canon F-73P instead, which I modified from the non-programmable F-73 by adding the two programming buttons. Made them myself out of modeling plastic.
My next favorite calculator was the Sharp EL-5030 which I still have and still love. Along the way I have bought the HP-49G+ and several basic scientific calculators.
I use a calculator almost daily at work building and maintaining financial IT systems. I am in a managerial position so my calculation needs are pretty simple. I have calculators on every desk at work and at home. I cannot understand how anyone can live without one within hand's reach at any moment.
I week or so ago I noticed the HP-15C LE reissue. I ordered two of them and one of these arrived today. Wow! Just wow! This calculator is the rat's ass, the bull's bollocks, the worm of the earth, the bun of the hamburger, the tooth of the tiger...! You get the picture. No wonder it is legendary. Oh I look forward to using it.
The size is very convenient, the tactile feel of the buttons is fantastic, the layout is pleasing to the eye. I have read the manuals and understand how powerful this calculator is.
My HP RPN lust did not stop here. I have a HP-35S, WP-34S, HP-12C Platinum, HP-30B on the way, too. And just out of curiosity I bought the HP-39gs childrens' calculator.
I am sure I will not be judged insane on this forum for getting my kicks out of calculators. Thank you all for the information and moral support you provide on this site and on this forum.