It's pleasing to see that all the hard work has paid off. .5mV ripple is quite good, but there are further gains to be obtained by going to 100 times lower for some areas of the PC. Many PC motherboards also have onboard switch mode supplies for certain areas too.
Well respected E.E. John Swenson has taken it to the next level with a plug in Linear PSU for the Mac Mini and other items. It will be released in a month or 2. John's new design is very quiet, and also has a Kelvin Sense option in the form of a small PCB that results in an even further audible improvement that John is a bit embarrassed about, as he can't presently explain why.
A Kelvin Sense module monitors the DC out at the end of the cable. NOT the output terminals, for an even further improvement.