I too just have had the update made to my M11. Coincidently I am using the SU-1 as well. Note I haven't cut the Amanero wire as outlined in the instructions - don't think this is necessary as I am using the SU-1 instead of the Amanero board. My initial impressions are good. Tight and controlled bass. Mids a clear with a slight rise towards the highs. The highs are clear. My settings are PLL disabled and 8x oversampling. Going to need more time to properly evaluate but my quick impressions will help anyone decide if they would like to update their M11.