@ozzy
In my system the typical audiophile improvements were there, improved soundstage width and depth, increased resolution, etc. etc. What struck me most though was how my system became more musical and less mechanical, even though it never sounded mechanical to me before adding the firewalls. The best words for me to describe the music is that it is now more fluid, elastic and even sensual. I would also add addicting. I do not sense a loss of dynamics. I do find my system unpleasant to listen to when they are removed.