Dirk Sommer, an elder statesman of audio reviewers, puts the iDSD nano through its paces:
“The days of having to invest huge sums in high-end audio equipment, are fortunately over. A computer, a smartphone or a tablet is present in almost every household. This along with a couple hundred euros for an app and the iDSD, one has a source that can inspire even in a very high-quality chain. Good sound has never been so affordable!”
Dank Sehr Mr Sommer!
http://www.hifistatement.net/tests/item/1313-amr-ifi-idsd-nano