http://www.macmusic.org/articles/view.php?id=147
Apogee is definitely known for the quality of their converters and the Duet is no exception. The converters sound great (24bit/96Khz), the latency is plenty low (I was able to track/overdub through a guitar amp-modeling plug with multiple backing tracks on an older Mac PowerBook with no problems), and the mic pre’s, while clean and maybe a bit too “pristine” for my ears, are of a very high quality for a sub $500 interface and will work out great for recording a wide range of instruments and voices.
