I have one that I've been very happy with for years, but is now sitting in a drawer.
Why? Because I eventually got tired of the dry analytical sound of my HD800/Benchmark DAC2, I've ended up with Chord Hugo M Scaler/Hugo TT 2 and LCD-5.
I think it's a fantastic amp, it drove my HD800/HD800S/HE1000v2/LCD-4 with gobs of clean power. I've been tempted to keep it and possibly put it back in my chain, but at this point I'm probably getting rid of my other headphones and just keeping the LCD-5. The TT 2 is certainly powerful enough for it.
If you're interested, PM me. I can include rear XLR cables.