I used the SA's in concert with a mundorf supreme in a 90/10 ratio on the mids for my Cornwalls and am very pleased.
Huge soundstage, little or no shout with great impact. I used Obligatto's on the highs and found them a bit laid back, but
then my hearing isn't what it used to be and I'd prefer that to sibilance and sssst....sssst. from the tweeter.
YMMV
Hibuck