When I first got this player I was amazed at how good the sound quality was, it truly is one of if not the best DAP's out there in terms of sq. However there isn't much to say about the Teclast T51 other then sound quality, because other then that this player is utter garbage. The user interface is dreadful, it has a mere 8 hours of battery life, adding files to the system is horrendously slow and updating the firmware is a nightmare. When uploading files to the main memory of the unit, I average about 3 mbps which is absurdly slow, and reading files...