Is this a good book to buy?  Any opinions on it?  (I am around a 1500, will i find this helpful?)

I have it :). I have not looked through it much, mainly because I prefer 1 e4, but I would say it is pretty good. It has only the main lines though (multiple ones for each opening, fortunately), so be prepared to get out of the book sometimes.

Anyone else have an opinion on this book?  Thanks for the help!

I have this book. I have not been playing d4 that long so it is something I have been refering to. It has decent lines in it to know. I would say it is worth having, of course wether or not these lines are best for any one person probably depends on their strength and playing style. It is a good start in any case though.

The lines are quite difficult if you're rated 1500, unless you're ready to spend a lot of times learning and understanding them.

But the book is very good.