I'm about 40 hours in. Just to add my two cents in case it's helpful ...
Yep, the sound changes quite a bit during the initial hours to my ears also. Listening every 4 hours or so, just for fun. It has sounded really good at times, and at one point I literally thought 'wtf?'? that sounds totally different - and not good', took the headphones off and set it back to cook some more.
As far as the sound character goes, I think that @melm summed it up very well when he wrote "Fluidity, clarity, bass extension". Maybe I'd describe it further as clarity first and foremost (at the 40 hour point), with a good measure of fluidity and natural sound, plenty of PRaT, pace and control, including bass.
Overall at this point it seems to be settling in, and sounds really good. So far in character it reminds me a bit of the Benchmark DAC3, but better, perhaps a bit more fluid and natural.
As far as whether there is a tendency toward relentless or hyper analytical sound, I I can see where that impression comes from. I'd describe it (as some others have) as not kind to aggressive sounding recordings.
For example, listening to some Mike Dawes acoustic guitar (Somebody I Used to Know, Boogie Slam, Slow Dancing in a Burning Room, Superstition, etc.) which are pretty 'hot' sounding recordings. Sounds great, but the sound as captured on the recordings can be a bit relentless.
With the DA005 the character of these recordings comes through crystal clear. At this point, it seems to me like a totally honest view into the recording and source. Unforgiving, perhaps, but I'm thinking that's as it should be - no editorializing or 'beauty filter' smoothing is applied to the sound at all. To be clear, I don't find it dry or harsh at all - just totally clear, in a good way.
Yeah, I understand that the sound should stabilize and continue to get better as I get to try it with more recordings, so consider these preliminary impressions of course, fwiw. Cheers.