Slightly contrarian perhaps, but… I have copies of the 2009 books from a friend before deciding to study this year. Not -that- much has changed. In other words - if you really know the material from the 2009 books, I suspect you’d pass almost any year you took the test.
If you have the 2011 CFAI books to double check the parts that might be new, I don’t see why you couldnt be just fine with the older Schweser books.
I personally preferred how it was 10 years ago - yes, they made you buy a bunch of text books, but at least I can (and still do) use the text books. Can’t imagine anyone a few years from now after passing the CFA sitting at their desk and pulling one of the CFAI books off the shelves…