Deb,
If you go to my review you will see more details. Right now the only comparison being made is to the stock unit.
Prior to deciding on the stock Audio Mirror I auditioned a number of DACs, most in my system, but others in-store. They included: Audio Note (1.1x and 2.1x), 47 Labs Shigaraki, Benchmark, MSB, and Bel Canto. I am going to place an order for the Audio Sector DAC shortly and will makes some comparisons to that unit.