I haven't had any issues with leaks. I take it through a car wash 2 to 3 times a week (north east ohio salty roads) and have a lot of product back there for work and they are all always dry as a bone.
Picked it up yesterday and I am loving it. Traded in a fusion so going from a car to this is a nice change. Also I am 6'4" and I fit perfect and there is still room behind me in the back seat. I'm an outside sales rep so I drive a ton and will update the more I drive this week and the next.