I was using the Matrix X-Sabre (a relatively old DAC), I also previously had a Benchmark DAC. My personal experience of this Audio-GD DAC since I fixed the -6dB issue on my pre-amp is that produces this great BIG sound that I'm still trying to control and manage through the rest of my system and my listening space. The bass is great and I am hearing stuff in classical/instrumental music that I was was not getting on vinyl and on previous digital sources. There is great sound staging (width and depth). Instruments sound real.
I'm still struggling with one aspect of the sound - it's a bit thick or 'boomy' and not a relaxed sound. But I realised that the vendor who sold me the DAC actually addressed the issue in an email to me while we were trying to solve the scratching/cracking issue. I think I need to change the position of my speakers (which are about 30 cm from the rear wall). This email also discusses a vendor's opinion about the differences between a Matrix DAC and an Audio-DG DAC. For my part, the other night I plugged in the Matrix DAC and realised the sound of the R7HE3 is substantially superior even though I'm not yet happy with the sound in my room.
Hope this helps.