Within a year, the outer cover was pealed off. The buttons were broken and the speaker was frozen. I had to manually open the speaker and reconnect the battery connection to reset the speaker.
Now coming to the sound quality, the low is lacking a bit here, I measured the frequency response, as per human hearing, it's from 84hz to 15 khz. With all this flaws, still this a very nice sounding speaker.
I wish, you guys could make a better version of this model, by increasing the driver size by 2...