I say yes too
If for no other reason you will learn somethings you didn't know when you take the class. I too thought I knew everything. Besides that, N.C. permit is one of the few that is recognized by my state of S.C. So, if you go 'south of the boarder' you will still be able to carry.
Looks like this is the morning for packing dot org to be down. They do that about once a week.