I waited 2 months to get this and is still very hard to get. The unit is a DAC and headphones amp powered by USB, no wall power supply. The original Duet was very successful, but this is said to be a lot better. You can use it on-the-go with a laptop and headphones. I will see if it would work with iPad via USB. Should be fun. I will post my impressions in a few, but here is the unboxing video.
http://www.youtube.com/watch?v=pcwoZPShTnE
http://www.youtube.com/watch?v=pcwoZPShTnE