Personally, I'm flipped on that. I have ZERO attraction to the round in an AR, but the notion of subsonic in a bolt gun has appeal if I lived where I could buy the can - a modern Delisle carbine, if you will. Also, the small case but heavy bullet makes it attractive as a short range cast plinker with the advantage of a rimless case. Kind of an updated Martini Cadet.
As compares to the .30-30. . . I regard them as different tools for different purposes and don't see a lot of sense in that particular "This vs. That" discussion.