I've been on one 4 night cruise and have researched a lot for our upcoming Western cruise. Everyone raves about the book so I ordered a copy of the deluxe version.
Not that I was disappointed, but I did not find it very helpful and I'm not sure I will bring it with. As others have said, I already knew most of the details and information from previous research. Also, large parts of the book are not applicable since I already booked the cruise, picked a stateroom, and don't need info on the Eastern, 3-night, 4-night, or 10-night cruises.
Also, half of the deluxe version is pocket folders to hold documents by day and jot down notes of what you will do (or did) each day. I highly doubt I would carry around the book the cruise because of its size. It will just stay in the cabin.
I would suggest save the $$ and get the small paperback version if you want a concise resource to take with you. Otherwise do all your research for free on the internet and make up your own planning sheets in Word or Excel.