I received a Megatron built by Søren Brix two days ago. Simply based on who had a Carbon available in stock at the time, I also bought Søren's Carbon.
I understand that head-case isn't really the place for 'listening impressions'. And, my grasp of audio engineering leaves much to be, uh, grasped. So I'll only note this:
I really, really like the Carbon, to the point that I'm now looking for a 007mki specifically to pair with the Carbon. Before receiving the Megatron, I was pretty down on my x9000s, and I was buying into the negative reviews. The Carbon does not fit the x9000s, in my opinion.
I am no longer down about the x9000s, not one bit, because Megatron.
I don't dispute any of the negative opinions of x9000s--I don't have enough experience to agree or disagree--but I do believe I found the right amp to pair with x9000.
Perhaps most relevant for head-case is my 'listening impressions' of Soren. Soren has been, in a word, delightful. I'm not an easy person to deal with--Soren was patient, thoughtful, fair, and he gave low-bias recommendations (when begged).
Soren prefers to use stock, non-boutique components. I have no idea whether that professional stance does or doesn't make a difference. I do know that Soren has a clear philosophy of work, and I grew to admire his reasons.
Thank you Kevin Gilmore for your design, and thank you Soren for bringing it into fruition.