If you can forgo Z-Wave smart-home devices, this is the smart speaker to buy (but that calculation could change soon).
Echo Plus (2nd Gen) Review: Excellent Sound in a Familiar
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Echo Plus (2nd Generation) Premium Sound Speaker Built-in
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Review: New-gen Echo Plus, Dot get smarter and enhanced
Meet the Echo Plus - Same great sound as our Echo (3rd Gen) with a built-in Zigbee hub to easily setup and control your compatible smart home devices.
Echo Plus (2nd Gen) - Premium sound with built-in smart home hub - Heather Gray
Echo Plus (2nd Gen) Review