I have had the Nuforce ref9, Trends, PS Audio Treo, Flying Mole, but my favorite so far is the Winsome Mouse. Part of the reason lies in Audiofeil's reasoning. I have it matched with a pair of Silverline Minuets. They like each other very much. The sound is neither dry nor sweet. It has nice detail without harshness. Nothing sticks out, just the music. The implementation of the designer has a great effect on the sound. I think Class D amps are the future of audio amplification. IMHO