The dire predictions of the new carry law in Iowa have been flowing for months, especially recently as the new year brings the new law. An opinion piece from Vinton, gives a glimpse of a couple of law officers thoughts on the subject. And also the "one life lost is one life too many" canard.
Benton county is a mostly restrictive one according to Iowa Firearms Coalition and Iowa Gun Owners. And the gun boards at the IFC have listed many of the difficulties there.
As I mentioned in the comments, if one life is saved by now carrying (especially from a once restrictive county), the benefits of the new law would be proven out.