I'm quite fond of the DS2. The only complaint I have is there is an audible noise floor if I put my head up to the speakers. Which really is a non-issue.
The reason I'm curious about the Commander is that I had both a Don Sachs KT88 (MSRP $3800) and Wells Audio Innamorata II (MSRP $7000), and the Wells Audio barely edged out the Don Sachs.
It misses some the tube magic – for sure – but it is slightly more articulate without being fatiguing. And since it's solid state, I can leave it on during the day without concern of burning out tubes.
So I've thought of the Wells Audio Commander for a while, and I'm not sure if there's really a benefit to moving to the Commander / another preamp... of if yes, I am at the inflection point of diminishing returns with my current setup.