Even though we’re not debating (thankfully) the merits of run in, I’ll add my $.02.
I’m still breaking in my new DAC which I acquired late December (as I haven’t been there that much). I couldn’t resist listening to it and my first thoughts were I may have made a very expensive mistake. It was smooth, but dynamically constrained and the soundstage not better than what i had. But I gave it a couple of weeks and it is now coming to life and the difference from out of the box is stunning. A magnitude of difference significantly greater than any component upgrade I’ve made.