The sound is overall okay, enough for my study, bedroom or balcony absolute, and is in the price / performance compared to other I tested AirPlay speakers in order. An alternative for my living room hi-fi stereo speakers it is certainly not.
Very good I especially like the unit the VOLUME UP / DOWN buttons, so I do not always run to the computer, or in my iPhone Remote app must change the volume! The alternative input options Aux-in (mini-jack) and USB (music edition on iPhone -> USB) I like that - but I have not yet tested.
I am satisfied with the product, and would recommend it for the purposes described above.