Rich, full sound, makes my headphones sound more natural and bigger. Great little dongle.
I would say that this is definitely a huge step up from your factory DAC supplied with your Mac or PC. However, if you are serious about sound, it's just ok. It's overly warm, I would say even muddled by it's propensity toward warmth. Again, a big improvement over any factory supplied DAC by the big name producers, but cannot compare to what's out there once you get your feet wet.
Cayin RU6: R-2R USB-C DAC/Amp Dongle
I hope this is the beginning of greater things to come. I love this RU6. The sound connected to a laptop running JRiver is really something special. There is such clarity and musical quality of the sound it reproduces. For only a few dollars, this is just wonderful and anyone thinking about a dongle must seriously listen to this before making a final decision. At these prices, I have bought many dongles from various makers. This is one of my favorites.