What you get with Meitner is still a very natural and refined sound but now you have better focus, you hear deeper into the recording with more details and layers in a soundstage, better instrument separation and most importantly a very nice step up in musicality. It is not a warm or dark sounding DAC. Yes system matching is key but it replaced the M3 with all associated equipment intact.
The Meitner is not warm nor is it analytical. It has a lot of detail but puts it out there in an unforced or natural way. It reminds me for the KRELL DUO lineup of amps. One of the most pleasing to listen to amps as is this DAC. It is more relaxing than my imersiv D-1, but I always like the D-1 more. Likely suits my uptight personality.
I am listening to the Meitner MA3i on a CODA #16 amp which is amazing. However, I am going to sell the #16 to buy the Meitner and going with a Class D amp or Schiit Wotan Class AB amp. Thiis is for my office system so I can downgrade a bit. Now that could be a bad move amplification wise. but it does not matter I would rather have a great DAC over a great amp.
My other DAC, the imersiv D-1 is even better than the Meitner and I use that a couple of ways. Using a great CODA #11 amp on speakers and also with a $400 used Schitt Aegir v1 2-channel amp for headphones. That Aegir v1 + imsersiv D-1 setup was the best I have heard the phone, even better than a dedicated $7k headphone amp (which I sold). This made me realize I want to spend $$ on the source. The $7k amp could not handle the firehose of data from the imersiv D-1 and was fatiguing.
BTW - the imaging on the Meitner is something really special. The stage is also huge. Today I listened to the Meitner since 7AM until 10PM (so far) and I am sick today with the flu. The thing sounded wonderful.
EDIT2: I think I am repeating myself with this post. I did mention that I am a little spacy today.

