The Lumin units without DACs included are pretty neutral to my ears as are the Auralic unit's. The Lumin combo units fit into two categories the Wolfson units are warmer and the ESS based units far less so. With either the G2.1 or the U1 the DAC will be your determining factor in the final sound along with the cable you choose. I don't use Roon or ever see myself doing so therefore my final choice between the two came down to software preference. I do still have a Teac Reference streamer/dac combo that is based on the Lumin architecture so with it I use the Lumin software. As it is in the Family Room and used for basically background music it is a less critical concern. Of the "big four" Innuos is the newest kid on the block and they all come with the built in ripper and are USB only. If those features are ok with you or something you want then consider them. In terms of dealer and factory support I think you will have better luck with the other three.
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Jack
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