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Given the current industry best practices and changes to Google algorithms, should I be using "Product name...Brand Name" or something like "Product Name...Free Shipping (or similar)" in my ecommerce title tags?  Thanks!

I'm working on an eCommerce site and had a question about my meta descriptions.  I'm creating unique meta descriptions for each category and subcategory, but I'm thinking of adding the same ending to it.  For example: "Unique descriptions, blah blah blah. Free Overnight Shipping..".  So the "Free Overnight Shipping..." ending would be on all the categories.  It's an ongoing promo so I feel it's important to add and attract buyers, but don't want to screw up with duplicate content.  Any suggestions?  Thanks for your feedback!