I don't really have anything to compare this to, since this is my first non-board soundcard (some might say I took quite a leap) To be honest, I wasn't even expecting that much of a difference on the price, since I'm used to seeing components paying way more, but the quality of the STX really blows me away! The headphone amp is something that could be better, my only other amp is a measly Pro-Ject headbox S, which performs pretty close to the xonar, although being slightly warmer and not as detailed, also I don't really like how it sounds on your...