Igorslab.de (formerly known as Tom's Hardware Germany) did an extensive test, teardown and review of this card. ->
Igorslab
I bought mine, after reading his test. Igor Wallosek says, the card is the best audio card for pc to date.
Most of the initial driver issues have been fixed in the meantime. At least for me.
Bear in mind you will need a dedicated SATA-Power cable connection for the card to use it. Molex to SATA-Adapters will not work, as the card
draws it's power from the 3.3V rail, which a MOLEX connector/adapter does not provide. Check the
FAQ.
I have used Voicemeter Potato in the past to route my audio to different devices. However, it was impossible to do this without sporadic annoying crackling in the sound.
Seems there is still some incompatibility in audio buffers or WDM drivers. However, switching to a Go XLR Mini fixed all my troubles.
Would I buy the card again? Yes. The way with a decent Headset (I use Sennheiser) you can locate other players in games like Battlefield is amazing.