Interesting discussion as I have been thinking about getting one myself. I do have one question for the DAC users here. Do you not miss having some control over the music equalization? I know that music should be listened to as it was recorded, but sometimes it is nice, if say listening to some dance music, to crank the bass and high mids up.
Music should be listened to in the way you want. There is nothing wrong with using an EQ if that's how you prefer it.
I would expect most people using DACs really don't need to use them, and have just been experiencing placebo effect.
Give this a watch;