At first look I couldn’t figure out what they bring to the table that the echo doesn’t have, then I realized. The dot for example is the echo but without the speaker, Its BYOS (Bring your own speaker). You would have to connect this to a speaker or a stereo system.. The Amazon Tap is a portable version of the Echo, with approximately 9 hours of battery life. Kind of line a jambox on steriods. I don’t know the sound quality of the Tap, but if I could add Alexia’s interface to my jambox, that’s interesting..
I currently have the Amazon Echo, I do not have the Tap or Dot. Don’t think I would buy them, since I have the echo, but it might be a nice entry level device..