I am new to this forum and MB. Am in the process of completing my order for a 2013 ML350. I live in a warm climate and was wondering if the ventilated seat option ($570) is worth the money. The wife's car (Infiniti) has heated and cooled seats that work beautifully. I have read complaints on the BMW forum about the poor functionality of the vent fans but have been unable to read any comments from MB owners who have this feature. Also, I am insisting on leather seats (perforated) because I cannot imagine a MB without leather. This is against the advice of the MB dealer/salesperson who insists that the MB tec leatherette is superior. Any comments/advice is appreciated!