Bought for ones (without attachment points) and they are very good. It looks like the designer took the time to really tailor them for Sonos, and it shows. They look clean and stylish and the packaging and instructions were professional. My only complaints are that they feel a bit overpriced and the plastic hinges aren't as strong as I'd like. Also, I bought 4 of these and one rattles a bit. Not sure if it's the mount itself or the paint next to it, but it's annoying. Overall I would recommend these for Sonos One.
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