In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

Understood.  Since the SXes are 4x faster, that READI equals one PIC NOP instruction for the same Xtal.

This code is also kind of funny because of the two stack limitation of PIC.  So I am pondering if the additional stacks make time delays easier as well. 
In some cases I guess so.  I am not really crowded as the PIC program is for a 512byte EEPROM and the SX-28 has 2K.

Overall, it seems that one has to depend more on loops or slow the SX by 4 or more to use these.  Timing can be 4x more accurate at the same rate.  Of course slowing means less wasted power too.  

It all confirms that the SXes are a home for upwardly ambitious PIC users.
{And I don't have to buy another chip version everything my project I/O changes.}

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