I have now used my 218 for a couple of weeks and I can now say why use the 218 if you have an 861+ID41 or MS600 as endpoints.

To get an improved SQ I'm sure that you must have at least an 818. Maybe I can use the 218 as endpoint connected to my AD88.

861v8+ID41, HD621, G98, Arcam P35, DSP7200SE, DSP7200HC, SW1600, DSP320.
2xMS600, 2xMS200, 2xDSP3200, AC200, Explorer2, 2x218, AD88, Prime, 251, 210