@glennewdick Thanks for providing more information. Just to make sure, are you referring to the full blown Lumin U2 or the U2 mini? I ask because you mentioned the U2 was way cheaper, but MSRP is $5K for the U2 vs $6.5K for either Aurender A200 or N200.
I am on a search for a better streamer, and maybe streamer/server combo. I am fairly new at this hobby, and after using various RPI4 based streamers (MoOde by the way is excellent software), my ears were opened when I heard the built in streamer in my Marantz SACD 30n player (I now use it more as a streamer than a disc player). Even though the Marantz/Denon HEOS software is not the best, I control the SACD through my favorite Logitech Media Server controller app which works great IMHO (I run LMS as my music server). So for me, as the search for a better fidelity (and dedicated) streamer continues, bonus points are awarded to those units that support LMS/Squeeze. I know Aurender is a closed system and does not support LMS/Squeeze, and have read some users have had luck with Lumin. Have read Bryston BDP-3 may still support it, and of course Innous and Sotm.