I'm very glad for the sound: fine and refined. But poor Technical Documentation (types of supported file not found, ...) and Mainly for Linux (nothing at all). Does not work with all Linux distributions, but works with openSUSE 13.2 (I had to test myself). Does not work with Android tablet not recognized despite its OTG USB output. The technical support is very light. Finally, very good sound but do not wait for support in Linux or Android. It's a pity.