I currently have the Lumin T2 and am very happy with it and the SQ. I have the Lumin connected through Roon with a Synology DS918+ NAS. I also have a direct connect from my Lumin into my Preamp so I can use the Lumin app and play direct from Lumin into my preamp. What I discovered through different tweaks is that the SQ is significantly better going direct from the Lumin via the Lumin app to the preamp. When I run it through Roon I lose some of the soundstage and musicality. My cabling is Transparent throughout and my preamp is an Audio Research Ref6SE.
As it relates to Aurender I am actually contemplating an upgrade to the N20 with a new DAC by MSB. MSB does not support Roon nor have an app; therefore, I would need the N20 and as my go between.
I must say I love my Lumin and will still keep it connected since I have 6 zones that use to stream throughout the balance of my house with a connection to Naim products as well as Sonos.
I have not had the chance to hear the Aurender but have had great feedback from a couple dealers as well as the recent review that was posted online by a major publication.
Look forward to hearing about your set up and experience @bigbuj once you get it set up.
Woots