When the DS DAC came along I just looked at all the reviews in general and barely any of them declared the DS to be a game changer, or the best DAC they has ever heard. They only declared it to be 'good' which in the audio review industry means 'not very good'.
This is probably why PS Audio are spending so much time on software updates, trying to extract decent performance out of it.
The Bricasti M1 is the opposite, it seems to have consistent raves.