I put down never, because I highly doubt that an android phone will ever work as well with my mac as my iphone. Also, I have issue with Ars described cheapness of the plastic on the S3. No thanks.
This was something that came up in conversation with a friend, who has a 13" mbp. She thought about an android phone, but if it doesn't work with her mac, then what's the point? The thing keeping her on her crappy nokia is that iphone isn't available for t-mobile on contract.
If android phones (or Samsung in this case) get to the point where they do work as well with macs or better, then I'd give it a shot.