I just felt that I wanted to share my one-month experience with 861/218/8000SE etc combo, since I have received so many good insights from this forum. Bottom line: for me it is the best sound system, I have ever experienced. Every day it makes me smile - I listen to music and discover little things, that I ve never realised before - Movies are more intensive - the different sound modes are completing the experience for the various music types and personal moods.
Some observations:
-prior buying 861, I did not like the add-on 218 for MQA. In practice is actually irrelevant - very nice integration, easy to switch, 218 not visible. However, in 218 Mode the display on 861 and speakers are "frozen". I am told that M is delivering the fix very soon
-MQA vs Trifield: yes MQA is more precise, clearer - having said this, Trifield, even Ambisonic is fantastic for Live Tracks, Electronic, Sonic Sound
-M is very responsive company. We had some issues with HW, M did send a new component within one day from UK to Switzerland - great Job
-Soolos great for local music. However, Tidal integration within Sooloos is totally outdated. I browse in Tidal App and then have to switch to Sooloos in order to find the respective album/track --- not nice. I imagine that could be relatively easily fixed?
-Movie picture has better resolution, which surprised me. HD621 does a perfect job - looking forward receiving the new model
-8000SE do not only sound amazingly great, but are just excellent pieces for craftsmanship and integrate very well into living room ..... almost like art. So wife is happy....and that makes happy life

Thank you again for giving pre-purchase insights.