I'm not an Apple fanboy (or Android). But I do like the AppleTV, its small and cheap ($99), and streams everything that I care about... my music library, Netflix, and I can rent moves from iTunes. While its missing some items like Hulu, or expandable apps... for $99 I don't care. And the new screen mirroring features are pretty nice.
Q could be interesting, but for 3x the price, what exactly am I getting? Android only, can't stream Pandora, etc, no screen casting option. Even AppleTV supports streaming from Android (via a 3-rd party app).
If Q were $100 or maybe even $150, I would seriously consider it just to get away from Apple, and for the potential hacks that will come, but they screwed up the procing big time.