A single track doesn't demonstrate anything unless they switch DACs at least once while playing it (otherwise the difference between that and some other copy of the song could be due to some other device, compression, volume, etc.). If they did that somewhere in there, I couldn't hear it. And even if it does sound different, it's not necessarily better... which would be fine, except multibit devices seem to cost at least $100 more than non-multibit ones. I haven't heard any fancy DACs yet, so take my opinion with a grain of salt, but multibitness reeks of snake oil to me.
I bought a Topping D30, which should get here tomorrow, to see if it combined with a Magni 3 makes enough of an improvement to keep the pair of them, instead of just running an HD650 straight from my laptop.
Measurements of that one seem good. Compared well to the ubiquitous ODAC. And it's half the price of the Modi-bit. (Also, the regular Modi seems to have
some issues, and it's hard to say whether the multibit version does away with all of them.)