ARC works fine on all my Sony's. 900E/940E/950G. But I no longer use it except for one of my 900E's. If I had my way all my panels would be dumb, no apps, etc. I prefer the ATV.
HT 7.1.4: Sony X940E, Marantz SR8012, LR: JBL Studio 580's, C: JBL Studio 520c, Surrounds and Rears: JBL Studio 530's, ATMOS: JBL Studio 210's, Sub: HSU VTF-3 mk5
MB 5.1: Sony 55" X950G, Denon X3500H, LR/Surrounds: JBL Studio 270’s, C: JBL Studio 235c, Sub: HSU VTF-2 mk5
Living Room/Office 5.1: Sony 49" 900E's, HTNT5's with wireless rear channels