The Durability of imSTONE RockBook is second to none!
I personally test using an A6 Flexi Cover for more than a year now, and it is still in ONE piece! The A6 is really easy to put in pocket and make notes whenever needed, especially when having meeting on the phone.
I place the A6 RockBook the same place where I keep my wallet, so it has been in the pants pocket. It is deformed, looked used, but it has experienced through all the weight pressures, usage and weather conditions, and it is surprising all still in one piece. Most notebooks would have given up in first few weeks, just from the moisture from the pockets, let alone sitting down on it everyday for 9 months.
I also put an imSTONE pen in middle of the book. Consequently, I can have my pen, whenever I need it, so my A6 was really good for me to carry around and connect thoughts before summarizing articles on computer or social media.
I was not a heavy book user, because I loose my books and pens all the time. So, A6 has been good test for me. Especially when I forget my HardCover RockBook or pen at the meeting, the A6 is my life saver!
My A6 is like below. It has been through lots of tough conditions and still all in one piece. It has deformed a little, but it is because of the pen. I don’t mind the deformation, as I can note take whenever and where ever I need to.
Hope the above will be able to help you make the correct choices.