The problems I've had include: difficulties with set up, long delays in responding to requests, it thinks it's in Seattle for weather and time, it's not sensitive enough to the wake word. Here's what Amazon UK say:
"I understand from query that the Alexa on the Sonos One is not working as expected.
"After checking your account I could see that the product you are referring to is not displaying in your amazon.co.uk account.
"When I researched further I found the device to be registered on amazon.com. That is the reason when you've try playing on Sonos One, you are facing a long delay.
"As the device was recently launched in Amazon.co.uk, the device skills and features are still under development as per our customers requirement and has not yet been added as a supported device in UK. That is the reason the device is showing on Amazon.com and when you give it any command it is unable to accept it or understand as it would be researching on Amazon.com."
Any comments from Sonos on why this wasn't made clear at the start and when it'll be sorted out?