Never heard of the SW1X DAC, but their website makes for some interesting reading. Their design approach reminds me of Audio Note, both based in the UK and believe R2R NOS is the way to achieve analogue-like sound. SW1X even offers Signature (upgraded) and Special (custom) models using primo parts such as Black Gate caps.
They also stress that minimal components and filters be used in the current/voltage conversion and analogue stage.
They also stress that minimal components and filters be used in the current/voltage conversion and analogue stage.