I was wondering if Burberry Summer is reformulated every year? I am wondering how to figure out how they differ, if they do, and if there are multiple versions/formulas, which one I would like the best (I think it started in 2007, but I've seen reviews on Makeupalley of 2009 and 2010 versions, and I'm wondering if they are different.) Someone has offered me the 2008 one, so I am trying to figure it out.