I've just swapped over from using the Filofax Time Management Week View insert to the Ray and Steve Enhanced TM Week View insert (must come up with a new name!)
In fact I created a version 2 of the insert with a little bit more room between the lines and some other tweaks to the format. You will see the links to the new version on the post and in the Diary Inserts page.
Having got unused pages of both formats I decided to do a very quick and simple pen test on both pages. I had printed the Enhanced TM insert on some A5 paper I bought in UK from my local Ryman stationery store. It is made by Mondi, 80 gsm and it says for Laser, inkjet printers and copiers, so nothing very special. I bought a 500 sheet pack, so enough to keep me going quite a while!
So here are the two pages side by side Filofax on the left, 'Steve and Ray' on the right:
and the reverse side:
And here's the stack of pens I used:
It might not be so obvious from the pictures... but here are my findings.
On both pages the CD markers bleed through quite obviously, they are a spirit based felt pen designed for writing on the shiny surface of a CD/DVD, so they will leak through paper easily. But the Filofax paper seems worse than the Mondi.
Next worst is the Pilot V5 Hi Techpoint this shows bleed through on the Filofax paper, but not on the Mondi paper.
There is some very very faint bleed through on the Filofax paper on the Pilot G1 Grip rollerball.
On the Filofax paper the first four pens are very very faintly showing through the paper, I wouldn't class it as bleed through, it is just the paper thickness really. The 0.5 Frixion is very hard to see through the paper on both samples.
So if anything if you are considering printing your own inserts, try to get a sample of the paper first and try as many different pens as you are likely to use before buying a large pack of the paper.