I have two of them, and they definitely improved the sound of my system. I use them with a Classe CAP 101 integrated powering B&W CDM9NT speakers, fed by a PS Audio Digital III Cullen modified DAC. Both the soundstage and hi frequencies are improved. I also like the Grant Fidelity tube buffer, which bettered the sound coming out of the DAC, making it sound more natural to my ears. I also can't say enough good things about how excellent the Grant Fidelity service is.