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alyshalynn
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i don't think the MGMAT books have changed much so you should be okay in using them... just try to get at least the 11th edition of the OG
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I doubt there will be any wrong information in those books - everything should still match. However, the materials are probably a bit improved. I would say you are probably going to lose 10 points compared to the latest books, which may have better layout, are easier to read, have better paper, etc. I don't think it is material enough to repurchase new books. Instead you may want to invest into some alternative guidebooks - see my signature for GMAT Club's recommendation on best GMAT Books.
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Here's something from my own experience:

I had OG-8 as one of the sources for preparation. Math was very easy there and can't be used as reference, but verbal was on the same level as in OG-11 and very close to the "real thing".
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greenoak
Here's something from my own experience:

I had OG-8 as one of the sources for preparation. Math was very easy there and can't be used as reference, but verbal was on the same level as in OG-11 and very close to the "real thing".

It's true. Math is becomming more and more difficult, for non-quant backgrounds it will be almoust ridiculous soon. That is the reason older prep books are almost useless for math, but for verbal they are pretty good source. Especialy considering that there is always hard to find good source for verbal practice.

The same situation is with paper tests - while they are excellent source of high-quality verbal questions, quant found overthere is almost comic compared to recent questions from GMATFocus and real exams.
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