But the depth of the bass and the clarity of the treble, as a nice warm sound, this unit does impress

I find that the sound is very good and the unit is very responsive to my voice even from a distance

One nice thing too is that the unit truly is portable and can be played for several hours (site here says 10 hours) without connection to a power source (via a USB cable that comes with the unit).

I absolutely love this unit and have had others express regret at purchasing the Echo, which clearly doesn't have the same amount of sound output.