The Bricasti’s is superb. I have used it with several amps direct and have been pleased with the output. The M3 is also very natural and neutral.
I just had a Lumin T2 on trade here so that is my point of comparison. In the end the volume control is in an app although the app was responsive, it is never going to be as easy as just picking up a remote. I didn’t here any issues or obvious limitations but the test was limited. It was also decidedly brighter than the Bricasti. This is not inherently bad or good, just a fact.
In fairness, I am a Bricasti dealer and not a Lumin dealer. Also, my Lumin experience was limited to the T2 over about a 10 day stretch. I have listened to the M3 a lot.