I say right away: I am not a very experienced audiophile so I can not give specific details.
By cons I can give an interesting comparison with the sound quality bluetooth speaker NFC smart Bolse which had already advised me and I've been able to listen. The sound quality is really improved on this enclosure Anker! I do not really have the ear to discern good from evil, but now the difference is really striking. It was much less seem to hear a "small mobile device pregnant" with this Anker.
On the upside, I would say, sound quality, battery that lasts quite a long time (the day comfortable), the simple but nice design, touch the enclosure nice, easy transport (supplied with a bag). Oh, and the price!
On the negative side, I find the on / off button a little cheap and not very pleasant. There's not much bass, just the minimum for music is pleasant (for the size and price of the enclosure we will not ask too much). Additionally the enclosure simply very little: no NFC, no sleep a priori, 3 buttons without ...
But ultimately these negatives are not so troublesome, the key is there and for the price it is really good. Of course it is not worth the Bose SoundLink, but she did a little closer still and costs almost 6 times cheaper!