I have used the Tranquility DAC for about a month now and while I cannot compare to analog as I have never used it, it transformed my system from a lifeless rendering of music to playing emotionally involving music. Granted my previous DAC was a Peachtree Nova (used exclusively as DAC), it is a different kind of comparison. Nonetheless, The Tranquility DAC is clearly more liquid, has better frequency extension and just sounds more real.
Like many others, I had to take a chance on an unknown product, but a few phone calls to Eric Heider made me understand that this company knows what it is doing. That I have not been dissappointed is clearly an understatement.