If they aren't cracked or splitting, try cleaning them with alcohol. If they are skipping or jumping, you may have a weak wiper arm (they have springs in them that are always under tension... they can wear out). Sometimes too, windshields get so rough from road grit that they can make the wipers work poorly too.
But yeah, I've bought the cheap refills, and the "high end" stuff.. they all lose effectiveness after 6 months and I saw no real performance difference anyway.