Century 21 should not be approached without a plan. It is chaotic inside. The racks look like they have lived through a hurricane at times.
Come for the bargains, but beware the headache that they might cause -- the search can be dangerous.
I usually find the clothing floors too hectic to search through (the men's sections seem to be better than the women's), but have had great luck in finding home goods (glasses, picture frames, etc.) here at fantastic prices.