Schweser Audio 2007 vs 2008 .. worth buying the new?

I got my hands on a copy of the 2007 audio CD. Is it worth buying the 2008? From what I was told, curriculum has not changed significantly. What do you all think? I just dont want to waste money on something that I can have for free.

you are probably fine, as long as you do not make that CD the core of your study focus