Surprised how Folks'? Do you know the methodology? For instance are they all tested at exactly the same gain setting?
I was also surprised as I have the M4 and it is by far the lowest noise mic pre in an AI I have ever had and has plenty of gain. Cannot believe the ADA8200 is better. Not being anti-Behrry, I had a UMC 204HD and the pre amp was very good, especially considering the price of the interface but not as good as the M4.
Dave.