Pros: great performance in a tiny form factor
A full review here, including the S-X speakers and W-1 subwoofer and LPS power supply:
Summary: The Icon2 is a great all-in-one device. It has a usb dac, analog inputs, headphone output, speaker output, and subwoofer out. It does all that in something the size of a book.
The only downside is that Nuforce has released several other products with reduced funcationality but likewise reduced cost. If you don't need all the bells and whistles, you can get the same level of performance for cheaper from the very same company.