@auxinput: I feed my W4s DAC2 with a PS Audio PWT via the I2S connection which is very warm and analog sounding. Several audiobuds have listened extensively to my set up and have made the same comment. Preamp and amps are tubed, though, so perhaps that helps.
By the way, have you actually listened to one of these DACs, or is this a case of an opinion based on words and not on ears?