I am satisfied with my purchase at rendering the sound is rich and powerful enough compared to the size of the product. Overall sound quality is very good. The voice instructions and LED notifications are practical. The long battery life. However, I have encountered difficulties with the "On / Off" button is blocked once and he seems not strong enough. I question the fact that it will still work after repeated uses. It's a shame because it spoils the qualitative feel of the product. Another little problem encountered is the inability to adjust the sound from my phone while it works with my tablet. I also find that the minimum volume is slightly too loud for a quiet listening. Highly responsive customer service. Overall, a good buy.