Amazon Echo review: The most well-rounded Alexa smart speaker yet, literally

The fourth-generation Amazon Echo arrives with a new round design, improved sound quality with support for lossless HD music streaming, and Zigbee smart home features baked in. Coupled with the ongoing improvements to chatty AI assistant, Alexa, is it time to upgrade to the fourth-generation Echo? Our in-depth Amazon Echo review has all of the answers.
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