InsideHW.com has reviewed ASUS Xonar Essence STX
A quote from the article:
>> ASUS Xonar Essence STX Review
During our visit to this year's CeBIT among other interesting products that we saw at ASUS' booth we noticed a section that was intended for "music fans". Star of that segment was ASUS Xonar Essence STX sound card and specification was promising unprecedented signal-to-noise ratio. We encountered grandiose announcements before, when it comes to sound cards, so we reached for headphones with significant dose of doubts. Although conditions at exhibition hall weren't perfect and far from ideal, when it comes to music listening, reproduction quality was incredible and breathtaking so we eagerly waited for this sound card to arrive in our test lab.
>> ASUS Xonar Essence STX Review