Here's my opinion on the DAC so far: I'm quite unimpressed with the sound quality, such a flat dull boring unlively sound with little texture and details, and a limited soundstage, a step down from a $32 ES9023 DAC/amp I got, I was able to hear lyrics better, delicate parts in a song, like picking/plucking/slapping on a string instrument, or highlights in songs you wouldn't normally hear, like they all had a significance in the track, this thing just blankets the sound all over again, like when you plug straight into a motherboard or a smartphone. If you aren't using any of the features on this, it's almost pointless if you want to really hear a difference in sound. Other than really nice build quality, just get a better amp, or don't expect anything special from the DAC portion. FiiO picked the lowest model of the AKM lineup btw, where they could have used a better last gen one with at least better SNR. If you love a small well-built unit with a lot of features to take advantage of high quality files, and a volume knob (which I partially dislike because it feels like when I turn it, it floats in between notches like it doesn't really catch or fall into a particular spot), then this is okay but don't buy this if you're expecting a noticeable upgrade in sound. I enjoyed my FiiO K1 better, problem is, these small DACs are weird to use with a desktop, I get them because the desktop choices in my price range seem like garbage, and not worth the extra money for the sound that they output, and even people complained about the E10K sounding dull and narrow. Another thing that's annoying me is that when I pause/unpause the playback of something, it randomly makes a small snapping noise but not all the time for some reason. Coming to think of it, I think I might have enjoyed the Monolith USB headphone DAC/amp if I purchased that one instead for the $100 price range.
UPDATE: I finally found and installed the driver, which shows up as "Q series" for some reason but it sounds a little bit better, not sure why. I don't understand why things can't just run off of USB no problem without dedicated drivers. My other DAC/amps do. lol. I'm still getting a weird popping/snap noise a few seconds after pausing media, it happens at random times; this same exact problem also happened with my FiiO K1s but that was all the time.