The Mythical HP 17BII++:
Improved by eliminating the MAIN menu, directly assigning menus to the top-row keys (and shifted keys)
And allowing the menu to be turned off (via "EXIT") like the HP42S:
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Advantages: No "MAIN" menu means lower-level menu access requires one-to-two fewer keystrokes
Also, being able to turn off the menu allows for two numeric values to optionally be visible
The Mythical HP 35S+:
Allowing soft-key menus on or off like the 42S
Advantages: Reverting to the Pioneer-type soft-key menu system allows up to 6 functions per menu
and reduces menu-function key counts
Also, being able to leave the menu on allows for multiple menu functions to be pressed
without leaving the menu (which further reduces keystroke counts)