Tell me about the HP 67

[Maximilian Hohmann]

(12-11-2017 09:39 PM)Craig Bladow Wrote:  I have an HP-65 which is a great calculator. My question is if the HP-67 improvements are compelling enough reasons to get one if one already has an HP-65?

As much as I value the HP-67 I would say no. Especially not from a collector's point of view. The HP-65 is an absolute must have for a serious collector (the first of it's kind is always special) whilst the HP-67 is "just" the top model of a line which comprises only two calculators.
And if you really want to use it as a scientific calculator there exist a dozen better ones now (HP-50G, Prime, Ti89/Voyage200/nSpire, ...) which can be had for a tiny fraction of what a good HP-67 will be sold for.