I can only speak for the PS Audio (and I should add I have no experience with any other high-end DAC), but I just had my Perfect Wave upgraded to a Direct Stream: I basically have not left my couch for a week. It's the rare piece of equipment that makes you want to relisten to your entire library. It is a detail monster, though not aggressively so, and is the most beautifully musical piece of digital equipment I've ever heard. I have fairly "analytical" speakers (Kharma CRM 3.2 FE) which can be a little hard-edged; now they are so pleasurably musical I can't stop listening.