Picked one of these puppies up today and after 6 hours with installation problems (Some Policy stuff in Windows 7, God darn), I could finally just lay back and listen to this awesome fidelity that this (cheap) card offers(!) It was like taken out from another world when I listened to it, compared to my old RealTek On-Board sound.
If you're looking for a cheap and very good Sound-Card (7.1 Surround-able with EAX 5.0 and Dolby Digital), the Asus Xonar DX Low Profile card, is just the thing!