The new dot with built in speaker is a great device. Perfect for locations around the house where you either have music solved (Sonos) or it is not really required (study).
I am pleased enough that I plan to put one in each major room in the house -- which is possible at $50 each vs the Echo's full price of $180. I am hopeful the Sonos integration promised in early 17 will live up to their hype. Having it everywhere let's me easily turn lights on and off (WEMO), manage my Nest thermostat and of course get Alexa's help at every turn (weather, remote for our TV, re-ordering consumables, etc).