Krutsch, I listened to the same E.One as you did - the exact unit to be clear, and came to different conclusions. As a pure streamer only I liked the E.one. Its DAC - not so much, as it failed to outperform my 15 year old Trivista except on MQA.
But as a Roon ready device, the E.One has two key limitations IMHO: it won’t support DSD upsampling by Roon, and its digital output is limited to 24/196, which negates the benefit of adding a DSD capable DAC and makes the E.One not especially future proof. I really like what Roon does to Redbook with DSD upsampling, not to mention I have a few DSD native high Rez files I purchased and cannot play on the E.One.
For me, but perhaps not others, this makes the value gap much harder. A Marantz NA6006 supports DSD for $700. The $700 difference between the E.one and the D2 nets you DSD, balanced outputs, a digital output not limited to 24/196, and a far superior DAC, so I still stand by my value assertion.
If E.One was $999, or better if it supported DSD, I think I’d be more excited about it even if its current DAC is ultimately not for me. I’d love to see an E.One 2.0 with those features at a compelling price point. That would also make more sense for existing Bel Canto higher Rez DAC owners looking to add a streamer and stay in the family, without losing resolution or features.