I read GTM this summer and although I’ve not started classes yet, I feel like it will be a tremendous help. It gave me a sense of what Profs really look for in exam answers, and goes beyond IRAC. That said, I think that it is a bit difficult to fully comprehend everything before you’ve begun classes. I’m currently making a condensed outline of the major points (hell yes I'm a nerd) that I plan to refer to once exams approach. Anyway, the book is pretty cheap (compared to LEEWS etc.) and I’m sure that it won’t hurt to read it. I say go for it.