Pros: Good with everything from IEMs to orthos. Un-coloured sound. USB input is excellent. Handy remote control. Good volume range with gain levels.
Cons: Headphones will need re-termination or a new cable to work with the balanced output.
If Audio-gd is known for anything, it is for invading Head-Fi with a regularly changing series of units consisting of headphone amps and DAC all in one box. Back when a combined amp and DAC meant a severely sonically compromised unit with either a poor DAC or poor amp, Kingwa demonstrated that it was possible to do it with little compromise, but instead provides products where, simply, a higher price meant you got more hardware, better components, lower distortion and better sound. That can often making figuring out what to buy confusing as, very often, there is more than just one product at any price, the result of customers badgering Kingwa with ideas and his working hard to entertain them.