I have close to 3,000 ft of Portra NC 160, which is un-perforated, which I shoot in a modified Nikkormat. So far it has always performed as new with no problems (various expiry dates from 2007 to newer). It is amazing film. FWIW, I have had very good luck with film that has always been refrigerated -- For example, I have some Fuji Super HG that expired in 1998, that I have owned and kept in the fridge since then, that seems as good as new. If the film has always been refrigerated, I'll wager that it is as good as new.