CFA Level I Books all, into, knowledge, contents, intended

spreads

Hi all,
Back in 2006, I intended to take the CFA exam, but I took a job offer and got stuck in my work. Now I really want to get back into it and was wondering if I could just read these and maybe buy Study “aids” from Schweiser or Stella to update the knowledge to 2009.
Do you guys think the contents have dramatically changed?
Thanks all