Why are the HP Prime and HP-35s so unpopular?

[Eddie W. Shore]

The HP Prime is (roughly?) based off the HP 38G/39G calculators, which are not quite as popular as the 28/48/49/50 series. As for the RPN, I never use the Prime's RPN mode, it's serviceable as a basic RPN mode, like the HP 21 or HP 45, except with an infinite stack.

The CAS is a separate mode from numeric mode, and any integration between two is at best rough.

As for me, the Prime is one of the calculators I use most often and it is one my favorites.

There are two criticisms of the HP 35S:
* Lack of Polar/Rectangular conversions in its function set
* Many bugs that were not addressed

Giving the 35S the ability to transfer programs to offline storage via USB would have helped.