When I was in seventh grade, I had my first Ramune. I got it in Chicago, and made a huge mess when I popped the marble seal and Ramune went fizzing everywhere in my father's car. I've since improved my technique (hold the marble-popper down for a while after opening), but I don't drink Ramune much anymore.
In any case, while I don't have the same feelings of nostalgia about Ramune that someone who grew up in Japan probably does, some nostalgia is there. It's hard to describe the taste (citrus-y), but it's distinctively Ramune, and therefore easy to associate with memories.
This KitKat, a very pale blue in color, definitely smelled like Ramune. Of course, it was very sweet. The chocolate was a milder flavor, and the cream between the wafers packed the citrus punch.
It tasted a bit like bubble gum, but what it really reminded me of was a kids' fruity cereal like Trix or Fruity Pebbles. It had the same kind of non-specific fruity flavor and sweetness, so this added to the nostalgia (my childhood favorite was Fruity Pebbles). It was fun to try, but I didn't want to have more than one of this KitKat. For some other opinions, check out Japanese Snack Reviews, Jen's KitKat Blog, and Tasty Japan.