I just traded in my Lumin X1 for some speakers. However, I did this because I got a sonically better streamer, Playback Designs Streamer-IF, than the one on the X1 and I am looking for an FPGA DAC (Playback Designs).
The streamer on the X1 is excellent. I only did fibre optical. It was louder than the fibre streamer on the Sonore OpticalRendu. The oR seemed a bit more refined. The Streamer-IF was as loud as the X1 and as refined sounding as the oR. The steamer sound of the X1 was not worse just more on the "wild side". A chocolate vs vanilla type of thing.
The feature set on the X1 steamer is way better than the other 2 optical streamers I own. If I decide to stay long-term with my modded Peachtree GAN1 I will get the Lumin U2 (or U1) streamer for both streaming and the Leedh volume. I used this before and it was great. I need SPDIF steaming with volume into the GAN1.
The DAC on the X1 was the very best DAC I have owned, and I have taken a step back with my Benchmark DAC3B (not huge). The "DAC" in the GAN1 is maybe as good as the X1 (not apples-to-apples comparison). The plan is to spend a lot more on the Playback Designs DAC but I what I have now is rather amazing, so I am wondering why I should do this.