One of the main complaints many of us have about Filofax inserts (besides the paper quality) is the lack of month-on-two-pages inserts that allow you to splice weekly, daily or notes pages between the months.
The Filofax month on two pages inserts are printed back to back, which means when you turn the page the following month is printed on the backside of the page. Contrast this to some other brands such as Franklin Covey which has notes space on the backside of the monthly pages. This allows you to embed the months in the weekly pages or add Financial pages, notes, goals, or anything else you want between the months. This is not possible with months printed back to back.
I decided not to buy Franklin Covey monthly inserts because the pages are slightly wider than Filofax inserts, and would obscure my tabs behind. So, like so many Filofax users (see Tim's extreme example here), I decided to hack my own Filofax solution.
I bought two Filofax Month On Two Pages inserts for 2013, and spliced them together. Here's the result:
The first page looks normal, January across two pages.
Then turn the page and you see February on the back side of the January page at the left, and January on the back side of the February page on the right:
As you can see, it's not an ideal solution. But it does allow me to insert pages between the months which is what I was going for.
Filofax, please take note! We are desperately trying to adapt your system to our needs, but could really use more inserts options!