Just got an ART9XA.
On my phono amp I can have 64 db or 70 db of gain - a switch on the front of the phono amp is selected.
My own experience has been that the ART9XA sounds so much better, in my system in any case, when I have 70 dB of gain - "light and day difference".
As has been stated previously in this thread higher phono gain really brings rewards - in my system I was not so impressed with the ART9XA when only using 64 dB of gain.