I received the same book and had the same question. My friends at Silicon Investor tell me it is a worthwhile read, but I can't attest to that personally.
I received the book as well and started reading it this weekend.
It's comprehensive, but basic. It seems it was written as a senior-level (maybe early grad-level) text for a college finance course. I figure I'll pick up a few things.
I got one also. I have not traded thorugh IB in a couple of months but for a while I was doing 40 -60 minis a day. Do not know if that was a factor or not.