I owned the Lumin X1 but sold it after a year or so. The Lumin streamers are great, but the DAC is so-so and about the level of the Schitt Yggi+ LIM (a warm rolled off DAC).
The X1 is both a streamer and DAC. The Leedh volume control on the Lumin streamers is the best digital volume control I have heard. My Benchmark HPA4 preamp still is better, but that Leedh is great for a DAC.
I compared 3 great streamers head-2-head, the Lumin X1, Sonore Optical Rendu, and PlayBack Designs STREAM-IF. They all sounded different but great. The Lumin is loud and brash, the Sonore is polite and refined, and the PBD in-between.
I ended up going with the Sonore because it was the cheapest (especially used these days). It maybe a little bit more technically challenging than the other 2. For example, if you have a power outage in your home and need to reset the streaming. It maybe a little trickier with the Sonore. I am a computer person so I can handle it. I also have a little bit more complex setup with PowerLine adapters to move the bits via the copper wires inside the walls of the house. I also have a cheap ROON Core computer.
Since the Sonore uses Optical it does not matter how sonically bad my setup is BEFORE the fibre optical (and DAC).
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I think the Schitt Yggi+ OG DAC is the best DAC under $15k. I use price as a factor in this evaluation, but the Yggi+ does not suffer much sonically to the more expansive DACs at $15k.
Over the past week my friend dropped off the Allnic D-15000 OTL/OCL Signature DAC. This DAC is the best DAC I ever heard and is significantly better than the Yggi+ OG, but it costs 10x more money. I did not think a 10x more expensive DAC would be that much better, but this one was, likely because of the unique output stage.
I put the Yggi+ OG back in the system once the Allnic DAC was returned and I enjoyed the heck out of it again. The OG is an excellent DAC.
I also have the Schitt Yggi+ MIB DAC in my system. I do not like it as much as the OG. The MIB is in-between the LIM and the OG, with a nod more to the OG's clean sound. Since I do not like the MIB I am going to upgrade it to the new Schitt Byggi, which is going to be introduced at Los Angeles CanJam this weekend. That DAC will cost $3500 and is supposedly the best DAC that Schitt has made. It will cost me $1500 to upgrade. I converted my LIM to MIB and now to the Byggi.
People like me that upgrade will be selling their old Yggi+ boards, which can be a cheap way to get the LIM or MIB Yggi+. Buy an older Yggi and install the LIM or MIB board yourself.