I picked up my new Ref 6 SE on Friday and after 50 hours it is starting to break in nicely, and I look forward to full break in after the advised 500 or so hours. I had a Ref 6 to demo about three months ago, so notwithstanding aural memory which can be short, the SE version comes across as having all the known great attributes of the older version while sounding more detailed, maybe a lot more detailed, plus cleaner with no veil whatsoever. All the music comes through in a most pleasing natural way. The tiniest nuances at the back of the orchestra come to light. To my ears, this is an absolutely spectacular preamp, definitely the best I've heard, and I'm saying that as I'm hearing the lower octaves start to flesh out more as the break in continues. I don't even want to mention the other brands I've had while raving about this one. I think ARC is delivering on what they've promised, in that the design and parts quality is so good now that we can really hear the magic of the all tube single gain stage. For perspective, I should mention some other parts of my system, which are important because they are particularly well matched to this preamp in terms of resolving power and being time and phase accurate, and not having global feedback just like the preamp: Vandersteen 5A Carbon speakers and M5-HPA amps, Audioquest William Tell Silver biwire cables, 3 feet long, and Audioquest Water balanced IC. In my opinion, the Ref 6 SE, while being expensive, is justified. I can't imagine what could be better.