There are a couple things that bothered me quite a bit: 1 - Pronunciation, a few words probably at least 10-15 (out of 650 or so) to my ear were mis-pronounced during recording. I must have listened to it 15 times (at 3x speed, which is pretty easy to do since normal speed is pretty slow).
I have to say that this book was useful in my study fro the GRE. Can't give this a great review but it was helpful
