it's not ready for prime time. I've used AROS and it's far, far from being able to be marketable to mainstream users. It lacks stability, software, modern features and it's UI is too old-fashioned(Zune upgrade cannot come sooner really)
I'd be more interested in a Syllable OS(or maybe even Haiku) based AresOne. It's got much more potential then AROS will, probably, ever have.