Just took "delivery" of my 2017 75D (60D when ordered and then held hostage by my out of state girlfriend for several weeks before finding its way to me) - woot woot woot. Best Tesla yet - it's noticeably quieter inside than my 2016. Could just be the new tires though - the 2016 has 2XK miles on it now. So I'm making this review of the ventilated seats to encourage Tesla to bring them back. I assume they will - perhaps improved. But I am really glad I stuck to my guns and hunted for a car with them - because they work exactly as designed and yes the cooling is noticeable. I have always had "sweaty back" in the summer time in leather seats. Maybe we all sweat in different places - well for me continuous contact with leather in summer results in a sweaty damp back even if the air conditioner is on. So I was very excited to try them today - and they work. In fact they work well enough that after a few minutes of them on level 3 I turned the fan down to level 1. Folks will complain about anything at TMC - they really will. Ventilated/air conditioned/cooled seats are supposed to keep you from getting a wet shirt and butt - and these do the trick *perfectly.* Maybe some folks want an ice cube on their butt. Maybe we have different sensitivity levels. I rented a Mustang GT last summer that had cooled seats - and yes it was some kind of active cooling that really did blast chilled air on your butt and back vs Tesla's solution of simply drawing fresh cabin air in one side of the seat and out the other. The GT's ice cube seats were *not* comfortable. The Tesla's effect is subtle but it works - my body's sweat has a continuous supply of dry cool air to evaporate into. It's great. Really too bad that Tesla discontinued it because no - pre-cooling the car is not the same thing. I've tried it now a couple times - pre-cool but don't turn on the fans, and what happens? After a few minutes an uncomfortably warm back. Pre-cool AND use the fan? PERFECTION. As for the delicate leather here is my take: I have *always* been anal retentive about leather seats and the way I get in and out of them. I avoid swiveling in seats with my body weight pressed down and I try my best not to brush/rub against bolsters on my way in and out of cars. I have always done a move where I get in, sit down with one leg outside the car. Then I use my left arm to lift my weight OFF the seat and rotate my body forward toward the wheel as I pull my left leg in the car. Then I relax my arm and apply my full 165-180 lbs on the seat only AFTER I no longer need to rotate. This avoids stretching/shearing forces on the leather - which over time of course will mess up the leather. It would make sense that these super soft, push premium seats have less tensile strength than non-perforated seats because they are full of holes. DUH. Already I see this effect - my drivers seat looks fine. But I took one ride with a buddy who is almost 200 lbs and forgot to ask him to be careful. He just grunted and plopped himself in the car. When he got out I saw the wrinkles people complain about. Lesson - take a bit of care and you should be fine. Probably not the best seat for children. With air suspension, ventilation, what seems to be more sound deadening than my 2016, and new premium seats this Tesla feels much more luxurious than my 2016 70D with Next Gens riding on coils. More lux, less sport - which is what I wanted. The ride is so much nicer over broken pavement it isn't even a close comparison. Yes there's float - that's what I wanted lol. No it wouldn't be as good a track machine and it feels more disconnected. But that smooth ride is the perfect way to accompany the smooth, vibration free motor. Goes together like peanut butter and jelly. For a real sports car there are other toys. For a long distance cruising machine I want the most comfortable ride possible over freeway expansion joints and other bumps/cracks/heaves. When the new roadster comes out I guess I'll have no excuse to keep driving my occasional Sunday Italian ICE machine. Silent mental note from myself in 2019/2020 to one of my other automotive heroes: "Dear Enzo - your creations were the love of my life. I sacrificed in more ways than one for them and will never forget them. But time has moved on and Elon's new roadster beckons. I have no excuses left to spew carbon in the air - even on occasion. One last ride together - one last 8500 rpm symphony through a tunnel giving me goose bumps. That V8 was the best sounding engine of all time. But the future is silent and here we go..."