The concept and reasoning for this interesting notebook, as explained on the website, doesn't make sense to me. I do like the idea though. I don't have a problem starting new sketchbooks. What does bother me though is lugging around the old one, while I want to reference back to the images and notes in it. Theses sketchbooks don't even solve that actually... I still find the concept interesting. It's even inspired me to look at how I use sketchbooks, verbalize it, and admit to the problem I have with them [however minor it is].
Additional note, I enjoy the Us page of the website. I enjoy how the visualized the process.