Not to start a **** show here but its not bad information.
Here's what the op asked for.
"...Would appreciate people's input (i.e. suggestions/avoids/benefits/cons) concerning what you know and have experienced ... thx as always ! " ...
I just provided what I did personally, my experience with an alternate suspension choice and, some of the mods I know of necessary to improve the factory setup. These are well documented in Mopar Action Magazine articles and on Firm-feels website.
I'm not against doing these mods if that's what you want to do and that's where your budget and interests are.
He asked for experience with these systems, I provided mine.
RMS Suspension Systems flat out work and do exactly what Bill Reilly , the owner/supplier says they do.
I have no doubt that HDK's systems and Denny's claims are also accurate.
Your setup works, so does mine.
Here's my "Pinto/Mustang II system" .
RMS Alter-Kation front suspension with power steering and 11' wilwood brakes. Very high quality, very well engineered and fantastic service from Bill, the owner.
View attachment 1715937562
View attachment 1715937563
Street-Lynx rear suspension,
View attachment 1715937564