The PS Audio is a tremendous product. Although it doesn't directly relate to sound quality, one of the things I like about the P600 is that its operating principles are logical and straightforward. It's good engineering as opposed to what some other product types offer. Accuphase makes a similar product, but I think its price is in the $8,000 area. Within the context of my system (Pass amplifiers and Wadia digital) the P600 is flawless. However, I suspect its benefits are strongest on front end components. As with any tweak type product, give it an in house audition. PS Audio policy is to give a 30 day trail. You can't go wrong with that! I personally think the P600 is a bargain.
