Oh, that's me . I've only just read this thread but it is true that a couple of days after trying Paul's Airlink transformer I have placed an order for one (3000VA). It's also true that I have recently had on loan a £1500 interconnect and one at £2100; the Airlink made the bigger and more fundamental improvement (and I use a very different system to Paul's).
Glad it has been working out. It worked excellently in my old home, but I have some intermittent DC on my mains now and never got around to fitting a DC blocker to stop the buzzing.