OK so.... I auditioned the ART9, 9XI and 9XA at length using the Lp Gear YouTube through the sketchy bluetooth connection to my primary system.
My main conclusion: I'm never going to intentionally listen to Pink Floyd's "The Wall" again. Clean sound but a studio-contrived facsimile of musical instruments played by talented musicians. Having played it close to 100 times to listen to the AT cartridges, I'm done for life. The only semi-convincing image is the snare, and it still sounds canned. Not a good choice for serious listening. (I did, however, enjoy the kids' chorus - reminded me of grade school.)
That said, I found the 9XA the most spacious, but I'm concerned that part of what I'm hearing is inexact equalization between the .2mV XA and the .5mV XI. Any thoughts?