Are the Miami Dolphins overpaying for Ndamukong

Are the Miami Dolphins overpaying for Ndamukong Suh? The guaranteed money is close to $60 Million dollars. With his trouble on the field do you think the Fins are making a mistake or landing the best player in the free agent market this year in the NFL?
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Barring a breakdown in formal contract negotiations, Ndamukong Suh will sign with the Miami Dolphins for a deal that will pay him approximately $114 million with $60 million in guaranteed money, sources told ESPN.