Hi Guys,
I was very careful to "not" say that one was better than the other, for I haven't had the opportunity to directly compare.
I know that the decisions are not based on any one issue, but are multi-factorial and there were some other "manufacturing/production issues" out of NuFORCE's Control that were also involved forcing the development.
As well the trickle (down/up) of technologies at lower price points also entered into the EOL for the MCH.
That said, I have had substantial experience with the STA-100 module and when well burned in, it has sonic capabilities well beyond its weight class, but it will depend on your system and listening environment as to how well you can discern them.
The MCH Series will be well supported, and while I am not at liberty to expound, the MCA Series has additional potential, again at a lower price point for NuFORCE enthusiasts.