The rear climate package is 700, not 900 (the cold weather is 900...), but it also depends on whether you're leasing or buying. I leased, so the difference in the lease payment came out to not much more than it would have cost me to have the windows tinted myself (maybe about the same), so might as well get the rear climate to go with it. I also have a black interior, which helps the factory tint look a little darker than I've seen on others with the gray or tan interiors, while still being legal.