Bluesound Node2

I have the Vault 2 in my 2 channel system and the node in a HT system (the Node plays 2 channel only).  I think the DACs are the same.
My channel system is a higher end system with a great DAC (Mytek Manhattan).  My HT system DAC is more prosaic, utilizing the 10 year old Onkyo receiver included DAC
The Vault is connected SPDIF into the Mytek and sounds much better than the Vaults Internal DAC.  The Node is connected to the AVR with Analog inputs because the Node definitely has the better DAC.
  Tidal may be a wildcard.  Bluesound can decode MQA.  If Tidal ever releases significant MQA content then you will want to listen to those recordings utilizing the Node DAC.  If that ever happens I miy use an an unused analog input on my preamp for the analog output of the aVault.

All DACs sound different, and most think the differences are fairly significant. Your should try to listen to a few in the same system if possible before you decide if it's a worthwhile investment for you. This is an area of great improvement in the last couple of years.

If and until the market accepts it, MQA is another recipe of fairy dust. I would be hesitant to make any decisions based on MQA compatibility. Cheers,
Spencer

I replaced my Mac mini with a Node 2 in April of this year and I haven't look back since. The on-board DAC (Burr Brown PCM5122) sounds just fine if you want to stop there. I have the Schiit Bifrost Multibit and the Chord Qute EX to play around with and both of these DACs sound quite a bit better than the on-board DAC and they should considering all. 

I have a Sonos Connect that I originally tried it's built-in DAC, but then ran a coax cable to my outboard DAC and it sounds much better.

As stated above, it would depend on the DAC.