Just got it in my system last night and my initial perception is similar to Jseminetta's - a cleaner and deeper bottom end is the most immediate thing to jump out at me. I get hints of better staging here and there that will likely get better as it breaks in a little more. I'm hoping a more consistent power flow will make the clocks that much more accurate and jitter free.
I left it running today while at work, so I should be able to get some good listening in over the week-end. The Cullen mods on the Sonos and PS Audio Dac 3 seem to be settling in nicely as well lately. I'm very happy with this set up now.