[weingarm]

I have the ventilated seats in an F90 M5. Like others have said, they are useless except for special circumstances (which are uncommon here in upstate NY):

High ambient temps over 85F
Plus
You are really sweating when you get in the car

Then they help "air dry" you for the first 2-3 minutes after you get in the car. Once the A/C is cranking, you don't need the ventilation function anymore.

This situation happens to me only about 4-5 times per summer so the value of the ventilated seats is minimal.

I definitely could see the benefit however in southeast US, TX, AZ. Or Dubai!