I bought my first HP12C in about 1984 or so, and it served me faithfully until 2002 when I lost it while travelling.  I searched for another one to replace it, but found one difficult to come by in my area.  So, I decided to buy up and purchased an HP 49G.  What a mistake!  I know that many people view the HP 49G (now 49G+) as the flagship of the HP line, but for me that was a disaster.