I agree with Vic (Arrowsmit) on all counts.

I read an article or something several years ago about different feather cuts and how quiet they were. All else being equal (length, amount of helical, etc.) here is how it's supposed to be, from quietest to noisiest.

Parabolic
Sheild
Bananna
High Backs

I shoot sheilds because I like the looks.

Chad