Thanks for posting your early impressions. I enjoy my M9 immensely. I have an excellent custom tube headamp, otherwise the M9 would be getting a lot more use. Powerful, neutral, transparent. Maybe a touch of warmth in there, but not much. I have burned through a bunch of amps before settling on the M9 - Auralic Taurus / 430HA / V281. M9 is my 'keeper' amp.