We have an Black Granite Met Eco and an Cyrstal Red Met LTZ with RS Appearance Pkg. LTZ is loaded and rides completely different imho with the 18" wheels and gets slightly less mpg. The LTZ just looks bigger. Yeah the Pioneer Sound system is pretty good imho. Remote Start is great if you remember to leave the Air Cranked when you exit.
Love them.
(Sorry don't have any good pix of rear but yeah the rear diffuser is different on the Eco.)