The price / quality ratio is EXCELLENT to read the mp3! - Its powerful and perfect for a device of this type. Strong bass buffs will be a bit disappointed. But that does not particularly mean that there is not one (basically, no Boombass). The sound is very well balanced. The acute are not overrepresented. Highly saturated music we can listen, (typical thrash metal), distinctly, without any crackling or saturation problem of pregnant and without being denatured. - More than enough volume for a 30sqm room for example (and probably much more). I am very satisfied. Music everywhere without having to deprive others of reading, TV or whatever because quon no other choice but to put the living room chain (too) strong. - Easy access. On "plant" a USB key, it activates the "ON" button on the back, and it works.
The only flaws (and unique reasons for my 4/5): 1 - the radio is not terrible. (But that's not why we bought this, right?). 2 - you can not navigate folder by folder. The titles are displayed respecting their container, album by album, folder by folder, but the speaker aligned one after the other. We must zap the songs one by one and not folder by folder when you want to navigate from album to album.
But it must be remembered is only for thirty euros. It is difficult to find better. 4/5. (Allow the purchase of an AC adapter to charge the device and do not depend on the USB and PC).