More ecosystem would be nice although, with an Android tablet, I gather that doesn't matter any much as you can cast the screen in any case. In fact, I'm seriously tempted to pick up an inexpensive Android tablet just for that purpose.

But I agree that Chromecast gets things just right. I want the ability to "throw" an image or video from my PC, tablet, or phone to my big dumb screen on the wall--whatever proprietary smarts the TV manufacturer is trying to make me interact with--and that's exactly what Chromecast does.