Yesterday my m8s pro W came in the mail. It's an AmLogic box running real Android TV. I finally finished setting it up and have some thoughts.
The Shield TV was in our room before and got relegated to the main TV as the kids game on it often. We used three apps primarily:
1) Netflix 2) Xfinity Stream (modded from xda-developers) 3) MX Player
No issues with any of them. However, I found that there is no Bluetooth, so the wireless Trackpad I used for the mouse did not work. But I plugged in a mouse, so that was that.
It's pretty gutless and the remote has a bit of a delay for all functions. If you use the voice remote, it will cut off the first second or so of what you say. Also you have to press the voice button to make it active, so aside from Assistant, I haven't been able to use it for anything.
I found it for thirty bucks for the 2/16GB version with voice remote. It's totally worth it, but it is slow compared to the Shield TV.
The Bluetooth equipped - (S912) MECOOL M8S Pro L with Voice Control remote runs ring around the slow poke, runt of the AMLogic litter - the (S905W) - Pro W