BTW, I received my two new Chromecast Audios today. Very easy to set up, and they cast just as you would expect. I have one set up permanently to a kitchen speaker that we use. The other will be attached to a portable speaker that we'll place wherever we need it, including outside, using a battery pack.

At the moment it all works as expected. It...casts. That's great, and it's way better than bluetooth for a bunch of reasons. But I'm still waiting for them to add the multi-room audio capability, and that's when these things become a great buy.

I also ended up ordering a new Chromecast, mostly because it's 1080p now, and has 802.11ac. Later this year I'll probably end up upgrading my Roku 3 to a 4 because I have a 4K TV now.
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Matt