Wow! It's the only adjective that really works. I truly understand what all of the source first people are really getting at. The Cullen IV modded DLIII has improved every piece of my system. I have always loved my 650's and my Raptor, but they have been taken to a whole new level. I had really enjoyed the RS-1's at first, probably b/c they were so different than my 650's, but recently they just weren't pulling me in. I found them too fatiguing, even with a tube amp. Well, turns out getting a better source has fixed all of those problems. All of the things that originally pulled me in on the RS-1's, great up front punch, liquid mids', great, detailed bass are back X 10.
I also was considering selling my HR Maxxed Desktop. I even started a thread in the amp section looking for a good SS compliment to my Raptor. The sound of the HR was just not as inviting, too harsh, still great, but I really saw no reason, ever, to choose it over the Raptor. Well, hook up the new DAC, and with both of my cans, a 180 degree difference. No more harshness, just the liquidy, transient speed and detail you'd expect out of a great SS amp. I will happily not be pursuing any other SS alternatives.
This is one incredible piece of equipment. I was on the fence for a long time, now I wish I would have made the plunge long ago.
Really, I only want to give the HD800's a try, and after that, I think I'll be set for a very, very long time.