I havent adjusted my neck slot on Rune Fencer in awhile, so it was actually nice to see this thread to make me rethink my set. I personally only have the +1 neck because at the time I bought it, +2 necks were roughly 80-100 mil. It looks like the prices are down to about 35-40 mil for a few servers(Asura and Bahamut). So if you have the gil, then sure go ahead buy the +2. If you dont have the gil, can always buy the +1, it will serve you well. And its only like 3 mil.