Hi Sonos (I hope you read this)..
I'm returning my Sonos One today, but as part of the return procedure, I didn't get a chance to say why, so here are the reasons - treat is as bit of product feedback.
First of all, the Alexa trigger word rarely works properly. The One seems deaf to it most of the time and I have to keep repeating it and/r shouting at the One to get it to trigger - even in a quiet room. I had an Echo in the same place, and rarely got the same issue.
Also, when the TV is on, the One will trigger Alexa constantly. During an evening, it will 'bleep' at me 20-30 times. Alexa doesn't continue to listen, so you rarely get Alexa replying with something, but the beep is annoying. Kind of ironic that it will miss-trigger so often, but not trigger when you want it to.
All that said, the audio quality is so much better than the Echo, and I like the idea that the One becomes a speaker on my network (so I can use it with other things like SmartThings apps). So, the One is going back, but I'm going to get a PlayBase. I'm assured by Sonos Support that I will be able to use it as a speaker with Alexa, so I should get all the advantages of the speaker, without the disadvantages of Alexa miss-triggering.