I got a week ago. this is my note:
1. very loud volume. My headphone is akg k7xx, it only takes less than 1/4 level of volume, it's been very loud.
2. rapidly drain my handphone battery (nubia)
3. if used for streaming app from android (example: spotify), then sound signature will not change. sounds exactly like production by nubia. So this DAC only works like an amplifier only. (of course not in practice). This is a classic android problem with digital sound via usb. not a problem in this dac/ upsample problem. (so you do not get disappointed with this DAC)
4. if used to play flac / dsd through hiby music in android, choose setting: "Exclusive HQ USB audio access", then digital sound via USB to DAC is pure. This DAC will shine.
5. if used for streaming spotify app from windows, i use version 10, then DAC will shine as well. So I just use this DAC to be paired with notebook only. temporarily resting Fiio X7 II while charging
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5. So how is the sound signature in general? I have been familiar with ess dac, starting from Fiio X7 I, II, and hiby R6, exactly this is the implementation of the ES family. Very typical. All the details came out, very airy, quite flat and neutral. the soundstage is very wide left right, only the depth is less. separation between the instruments is quite subtle.
6. compare with other DAC? I used to have only Fiio E17K. Clearly SE4 is better for the sound division. I am also waiting for this comparison review with SMSL Idea, which is not so I bought considering SE4 is cheaper.