Tough comparison because my last tower PC had an older high-end Creative Sound Blaster card with the SPDIF output (over five years ago). I had it in another room from my entertainment system but did connect it determine if the SPDIF worked. It did (but I hadn't considered a network set-up because I had yet to purchase a DVD player with newtwork/wi-fi to integrate my Adcom GTP-880) and had it play into some Creative desktop speakers via analog. Five years ago my PC audio was just low level downloads and CD quality playback. Eith the Dell XPS I have now, I couldn't get the Optical port to be reccognized by the Adcom GTP-880.
I would say the sound from the Hiface 2 into the DAC sections of both the Adcom GTP-880 and now the Integra DTC-9.8 is more acurate then the two USB connection laptop-to-desktop DAC set-ups (Nuforce Icon HDP and Schiit Bifrost) that I have owned. Using the Hiface 2 through the SPDIF input of the Bifrost was still below the sonics of connecting Hiface 2 directly it to the two foremantioned pre/pros. with the Adcom (there were connectivity issue (given the unit was dying undertsandable) and with the Integra perfect performance.
If you have a desktop PC tower or a laptop, (and neither your receiver or pre/pro with DAC or your outboard DAC) has HDMI or USB arangements for digital transfer, I would be inclined to reccomend the Hiface 2 over a Sound Card or paying extra for a DAC with a USB input. I have read good thngasabout the Asus sound card, but since I ony use a laptop it wasn't an option.
Given the fact that I can get the same sonic playback (to my ears) of the digital information from my Dell XPS laptop via HDMI to Integra's Bur-Brown DAC as with the Hiface 2 using SPDIF,. I'm going to keep things simple with HDMI. The only drawback is I need to adjust my laptop settings for long playback sessions (from the laptop going into sleep mode) and I turn the TV (LCD) off unless I want to use dual monitor support. Before I upgraded to Integra DTC-9.8 when I used HDMI from my laptop to my Phillips LCD TV and used the SPDIF output to my Adcom GTP-880, the sonics were just so-so, so I moved my Nuforce Icon HDP into the entertainment system, found lots of keystroke noises, moved up to Bifrost, (better clocking fewer errors, mediocre sonics), then went to the Hiface 2, and discovered how performance was a wash against HDMI with the Integra pre-pro. In the end I'm glad I picked the Integra pre-pro which for its cost (used) I caould barely get a decent preamp or stand alone DAC alone. It also has a decent headphone jack, which I will explore in the future, when I can borrow some decent cans for demo.
Listening to pc audio through the Integra and 4 channels of my Adcom GFA 7607(175 RMS ea) biamping my KEF Reference 4 speakers ($5K MSRP) is very enjoyable. I'm thinking that for keeping a pre/pro that can do surround or 2 channel playback it's hard to beat. (looks like I would need to spend three-fold to update to a top preamp with built in DAC's (The Bryston BP-25 with DAC was a thought, but I'm not sure I want to commit to 2 channel exclusivley), As the Integra has balanced outputs, I will be updating my amp in the near future to something more appropriate for the 5 KEF reference speakers I use for video and to make the big KEF 4's shine in 2 channel direct mode.
Given the competition/cost of other USB to SPDIF converters, I think M2tech has done a god job with Hiface 2 for simplicity and performance. Given your environment for using your laptop with your entertainment system, other system may make more sense or given your laptops performance using a powered hub may improve performance.
PM me direct for other specific questions. The Hiface 2 and 15' Mogami SPDIF coax cable I have are available for consideration.