The new Echo Dot is good enough to be the default Alexa speaker in most rooms of your home. It no longer sounds horribly tinny, and it's half the price of the bigger Echo. If you want better sound, you can easily hook it up to a larger speaker of your choice, or match it with another Dot as a stereo...
Much better sound than previous model; Still the best inexpensive Alexa speaker; 3.5mm jack for more powerful speakers; Alexa remains the best voice ecosystem for smart home control
Alexa isn't up to Google Assistant's level at answering broad information queries