The biggest issue with laminate sails, like Kevlar and Mylar, is delamination. Dacron sails will be more prone to losing their shape.
It's hard to tell the quality of the sail by looking at it in a big. If it's clean and crispy, then it's probably good enough. Unless you're buying a racer, though, don't expect a first rate sail inventory.
Whatever's there is probably good enough to get you going and you should probably plan on buying a new set within about the first year of owning the boat. You may get lucky of course (and good luck!) but more often than not a new sail or two will be on the menu.
By the way, there are few things better than new sails...
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