First two trips, we had the spiral version. I love the pockets to stash receipts, etc. in for each day.
This past trip, we felt like we really didn't need the book, so I got a little divided pocket organizer in the dollar bins at Target and labeled the days myself. Worked great!
I guess in the end, it depends on what you're looking to use it for. For us, we didn't really use the park information - read it all before the trip, but never during the trip. So, we just ended up using the organized storage features.