These are genuinely gorgeous amps, sounding open, fast and very natural. If they worked well into the impedance dips of my Sonus Fabers, I'd still be using them, as I really liked their sound with my Kharmas. They also sound particularly gorgeous with Quads and are very popular in the Far East for use with 57s and 63s if the forums over there are anything to go by.
I've owned them since the end of 2011 and they haven't missed a beat. You can read my ravings at the time in the "Adventures in Amplification" thread.
Here are a few photos:




There a few older photos in my system here. More information and specs can be found on GRAAF's flickr stream here.
I'm asking €4,000 for the pair. Don't bother low-balling, as I just won't sell them!