For the past couple of weeks I've been rotating three blades from the Gillette factory in Russia, namely Polsilver Super Iridium, Gillette Stainless and Gillette Bleue Extra. To cut the story short, I couldn't find any difference. To me, they are the same blade, just branded differently. All three are very sharp smooth blades-excellent. Although there was some slight variation from shave to shave, I realized that I could not make a difference in a blind test. Right now, I don't have any 7'OCs and Astras to compare, but I doubt I'll find them much different either. It might sound odd, but I begin to realize that all the blades made in this factory near St. Peterborough are identical, just branded differently for the respective markets they are intended.