Tom,
You might have a hard time getting some responses on this one. I don't think to many people have the M40's. I have the 50's and had the 22's at the same time and it's well documented that I liked the 50's more. Better bass, neutral not in your face etc etc. The 22's however are more accurate and are brighter..............I hate that word but I can never think of anything better. I also have a set of the SS16 stands if you need them. Mint shape I just don't need them anymore.