Opus 21 is one of the best players made period, in my opinion. I loved the GNSC Opus 21, sold it out of curiosity and now own an Esoteric X03se at almost twice the price. Is it better, yes in some ways. But the Opus is far more flexible, has a digital in and can run amp direct, which annoys me about the Esoteric that they can't have a digital in. I have thought on more than one occasion of saving some cash and going back to the Opus GNSC mod......but again, my point being is a preamp does offer better dynamics, albeit a small increase.