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I have it paired with a Woo Eclipse DAC and Sony Z1R headphones and the sound is awesome. It is also true that the unit freezes often and has to be constantly restarted. In addition, when transferring music the items will show up sorted by a number, rather than artist name - see picture. It's very frustrating - especially for the amount of money spent. For the price, these issues are not something one should have to struggle with.
Obviously solid construction, intuitive and uncomplicated operating system with no apparent bugs as well as responsive interface with firmware 1.2 However, woefully underpowered amplifier somewhat improved with balanced output. Sound is greatly affected by underpowered amp. Sony over the recent years has consistently designed its products with underpowered amps. I don't understand in a product at this price point. Unless you plan on using highly efficient phones I would think long and hard on this purchase.