Yes! Most computers use terrible DAC chips and have power surrounding the audio train causing severe noise issues which I am sure you have heard. These are the "bleep bloops" especially heard from your processor and when you move the mouse. An external DAC takes the 1's and 0's straight from the built in audio CODEC, no bypassing that, and transfers them to either your headphones directly or to a headphone amplifier. For me going from my PC's audio to my Bithead and specially my m903 the improvement is monumental. I cannot stand to listen to my headphone out jack on my sound card.
Rest assured that the Fii0 and BIthead will translate those 1's and 0's properly and give you a much improved audio experience.
Best of luck and happy Holidays.