With additionnal tests today, with AP2 is like removing a veil over the music, everything is more precise and defined, the scene seems more wide and deep, the music is more vivid. Direct connection it's little fuzzier, the soundstage is more constricted.
It's not another flavor ... it's a definitive step up for me.
I am using GateWay NetBook as computer, win7, foobar+wasapi
BTW, I am not affiliated to Audiophileo. ;-)