pah, typed this all out and lost it, anyway.
Does it do something, yes, is it a whole lot, depends on point of view.
I had a pre2000 body Eclipse cocker which I made lots of changes too, one of which was adding an AKA LP chamber.
It did improve consistancy but a couple of fps, it also let me drop the input to about 180psi from 220 without undue effect on efficiency.
When I got it from G3 it was expensive (about $40 from memory) for what it did but I liked it, plus I am one of those "I'll do this to my marker even though I don't need to" kind of upgraders.
Value is subjective but I'd probably buy another if I was building a cocker.