Too early to say if it has fixed "all" the issues.
With El Capitan it was not possible to play DSD128 or DSD256 files to any of Chord's DACs without frequent drop-outs. Single-rate DSD files (DSD64) worked fine, but anything higher than that was a mess.
So far so good ... no drop outs even coming off a USB 3.0 hub.
So something has changed ... we'll see if the "good behavior" continues, or if it's just taking much longer than normal for such dropouts to occur.
Spoke too soon!
While the frequency is much reduced, they're still occurring. That's even with DSD128.
And that's running a fresh-install of Sierra and a number of audio players, on a 12 core nMP, so it's definitely not an issue with the source computer not being powerful enough or their being anything else in the chain causing issues.