I'm using a MF copper version in my system, it is much better of my old Audible Illusions M3 in every aspect: much more details, excellent image, very well balanced sound.
I use it with a VK-55 power amp and Hyperion HPS 968 speakers.
I bought it used (excellent conditions) at 1600 Eur; it is very well built and UK people that make it are very kind and supportive.
Ciao!!!