I'm probably going to get the digital word beating of my life, but I really like my Casio fx-991MS S-VPAM.
I knew a 77 year old still practicing VERY experienced engineer who owned a HP that was so old all of the numbers were worn off. I thought it was so funny that I took a photo... I'll post if I can find it.
BUT, funny or not, I learnt my lesson. I own six of aforementioed Casio; three open (work desk, briefcase & home desk) plus one replacement for each.
I can completely see myself fifty years from now still using one of those six, long after the others have died, and giving some kid as yet unborn 'til 2025 the word-lashing of his/her/it's lifetime over a holographic projection of an undersized portal frame... My greatest aspiration is to be the old guy at the end of the hall. Unfortunately it's a position that take a lifetime to get in! ;0)
Cheers,
YS
B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...