Earlier quoted context omitted.
It doesn't seem like a terrible deal ( http://www.sonos.com/en-us/legal/privacy ). What part of the privacy policy do you specifically have an issue with?
The part where playing audio, including that from 3rd party sources, doesn't need Sonos to get any device usage data. However they still want it 'to improve their service', and you can't turn that off. Not accepting terms means that you'll never get firmware updates.
As for the data collection you can't opt out of, it's super basic data like your ip and account registration info. How do you expect to use a cloud service if it doesn't know your ip?