I bought this as I realised I was carrying both a diary and one (or often two) notebooks around with me (I am not an iPad convert). I love the red cover and the elastic closure but most of all the size is perfect for me.
In the past I have never got on with a personal organiser, mostly because the pages were too small and hard to write on (the ring binder part always used to catch on my hand). The A5 size (the paper is A5 - the organiser is larger) is just right for me. It's smaller than the combined diary and notebook that I was lugging around with me, but large enough to write properly in.
The filofax came with a diary that spanned from the middle of 2010 to the end of 2011, with one week across two pages. The diary has a small notes section at the top LHS (above Monday) which at first I thought would be irritating, but actually has turned out to be very useful. The fact that the diary spanned from now to the end of the next year was also very handy.
In addition, there were 6 dividers (numbered 1-6), A-Z dividers plus address sheets, a notepad (with 50 sheets of paper) which fits into a slot in the back cover, a personal information section and a few sheets of dates/things for around the world (not all that useful to me; nor was the world map to be honest). There is also a ruler (which also marks 'today' in the diary) and a plastic envelope.
The only niggle (and it is a small one) is that there were just 2 sheets of 'to-do' pages, which I would have found much more useful than the 'clothing sizes around the world' sheets (that were filed in the bin). However, it is a small niggle.
Overall, I am loving this product and a number of work colleagues have commented on it with envy!