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I've owned one for months now. I have no meaningful first hand experience with other preamps, but compared to directly connecting my Bel Canto 2.7 DAC to my ML No. 536 amps, I notice more resolution and space between sounds when the 523 is between the Bel Canto and the amplifiers. I assume that's attributable to the superior attenuation circuit of the 523 vs. the digital DAC attenuator. Whatever the actual reason/s, the improvement is not subtle.