This thing is just incredible. Had it for a couple weeks now and I can tell you that the improvements in sound quality (stereo separation, sound stage, overall non-fatiguing warm tonal balance, etc.) using the I2S connection, are just delightful. Had a budget Fiio K13 r2r which I liked a lot but this unit is well worth the upgrade. Fully packed with fearures for customizing the sound to your liking, it canbe used as a stand-alone DAC, a DAC-preamp or a headphone amp. And the build construction is also much higher than what the price suggests. Highly recommended!