I was wondering how your shoe review number ratings are calculated. Is there a baseline or these ratings. I ask because in shopping for shoes I see the Nike Breathe Free II has a weight rating of 4.5 and the Reebok 3D Premier has a rating of 4.0. A very large rating differential considering these shoe both have an identical weight of 15.5 ounces. Please reply and keep up the good work tennis Warehouse.