From what I understand, those of you who already have a Perfectwave DAC I or II can upgrade to the Perfectwave Directstream DAC since it uses the same chassis.
CEO Paul McGowan explains it here:
http://www.psaudio.com/forum/#/discussion/6526/directstream-pricing-trade-ups-and-options
CEO Paul McGowan explains it here:
http://www.psaudio.com/forum/#/discussion/6526/directstream-pricing-trade-ups-and-options