The "reveal" event did show seven adults exiting the Model Y. I would assume that smaller adults and teens will be reasonably comfortable in the third row. Larger people may have to squeeze. Having those seats would be great for our family. We wouldn't use them every day, but the flexibility would be appreciated.When the only people small enough to use those seats, will require safety seats of some sort, which also won't fit, then I don't know what the real purpose is. Maybe that's where you throw the friend you secretly dislike.