I have 3 Prods that wear the RAI setups & I love them. None of mine have the folding option & I don't need it.
The actual stock you use is up to you. I believe mine have the UTG stocks, and they have a bit of play in them which can lead to rattles & flex at bad times, so I searched youtube & found several videos that showed me how to fix the loose fit.
Basically, you put strips of black electrical tape in strategic locations, & you keep the adjustable feature (even though I never adjust them) and they become rock solid & silent.
Used mine for years with zero problems, & I can adjust them to fit my wife or kids in a flash.
I realize this isn't exactly what you hoped for as far as feedback / comparisons, but I do hope it helps.