Just got my new Nano IDSD and it's working great so far with the new firmware. Plug & Play like it should. First impressions of the sound is pretty good. DAC is good and AMP leaves something to be desired but that's normal. Overall this isn't far behind the Modi/Vali stack maybe even as good which is very impressive for a portable DAC/AMP. Will combine the Little Dot I+ with the Nano IDSD as soon as I can get my hands on one. I think I will have a good setup with my Grado RS1i then EDIT: Definitely a keeper. A very versatile product. Works great with my Macbook Air, with my iPhone and can even drive my Adam Artist 3.