Soldato
I don't understand as to why the PS Audio power supplies are so much more expensive than the Airlink (apart from being in a fancy case); are they both achieving the same thing, or does the PS Audio offer something more?
The PS Audio supplies are wrapped up in the same "snake oil" mumbo jumbo as the Russ Andrews ones are. So called special cabling, audio grade components ect ect. Not only that, for the most part they have quite low KVA ratings.
If you have a good look at Airlinks site you will see they offer many different KVA ratings and will also build to customers own spec if wanted. At the end of the day, they are all just a balanced power supply. By it's very nature and the laws of physics, all a balanced power supply does is strip the mains of RFI and then supply a 100% clean mains source to your hi-fi. One that costs £1000's of pounds will actually do the same job as one that costs under £500, it just leaves you with less money in your pocket.