Visited this while in Atlanta last week with a couple of friends. The experience is one big advertisement but is very well designed. The size of the spaces, the visuals, the interactions, and especially the sound design were very well done. The design made what could have been boring or overwhelming a very enjoyable experience.
Some things they leave out. No mention of the Cola wars or their most famous competitor. Also no mention of cocaine in the original formula even in the myths and legends section. That section could have been a lot larger actually. I've heard things about Coke and Mentos, cleaning car batteries, pop rocks, dissolving pennies-don't recall seeing any of that in here.