Has anyone played with Windows 10 yet? I have it installed on a VM. It has Cortana built into the OS and it can be activated with the wake phrase "Hey, Cortana" similar to Echo.
I don't really know what other devices have wake words. My LG G3 used to work via "OK Google" but the screen had to be on AND on the home screen. The upgrade to lollipop also strangely removed that feature.
What are your thoughts? Echo has the advantage of being always on with a superior array of microphones and for me that's the main differentiator. But for the general public, Echo may be a hard sell.