Pros: SPDIF output, Virtual 7.1 for headphones, Small Size
Cons: Very Loud, Software was a bit of a pain on Windows 7 64bit
Alright well I just recently purchased it, installed from CD fine on Windows 8 64bit, not so much on Windows 7 64 bit had to find a strange hidden zip file to get it to work.
This thing is ridiculously loud, could be good for some high impedance headphones. Turn it down all the way before you plug in your headphones. I can hear pretty loud sounds when the system volume is set all the way to 0 (doesn't give me much range for small volume increments.
The SPDIF works great with it's provided 'mini toslink' connector.
The USB extension cable it comes with is quite nice as well.
I have yet to use the microphone input nor the virtual 7.1 for headphones (ATH-M50 isn't good for that)