That is a great deal, but at that weight it's an older bird. Not sure how old, but might tend to be a bit dry.Your recipe you plan to use should help with that. Just keep it basted. Maybe inject... I've never done one quite that big, but once you get in the 20+ range it is easy to dry them out due to long cook times. Do not stuff a bird that big. Some celery and onion in the cavity is good though.