Were any comparisons down with higher quality motherboard sound systems or just basic MB sound? Other than high-end gaming systems most store-bought computers tend to use really cheap components in order to keep the price down. You don't have a lot of choices if you're using a laptop but those with a desktop computer also have the option of high quality sound cards with a variety of outputs.
For notebook users the one thing I'm skeptical of is the lack of a subwoofer output. I guess you could go from the DAC to an active crossover but by the time you do that you've spent almost enough on outboard processing and active speakers to pay for decent passive speakers and an entry level receiver. Maybe they're aiming at computer speaker sets but if I were going to spend that much for a DAC I'd want good speakers and a sub.
Family Rm: Samsung 52" LCD, Onkyo TX-NR809, Emotiva XPA2 & XPA-3 amps, PS3, Oppo BDP-93, FIOS HD DVR, Salk Song Tower-RT, Song Ctr-RT, Song Surrounds, SVS PB12-Plus/2, Velo SMS-1, NeoTV 550, Roku 3, Harmony-1
Bedroom: Hitachi 42" LCD, FIOS HDTV, Onkyo TX-NR906, LG BD370, NeoTV550, 3x Sierra-1 NrT (LCR), Boston VRX srds, Hsu ULS-15, SMS-1, Harmony-1
Home Office: Onkyo TX-SR707, 2x EMP E41-B, Emotiva Ultra 12 sub, and a small media server