Although im a kickstart junky, this is one of those less than spectacular projects.
As you might have spotted, they probably won't make it to their funding goals in 3 week's.
I've actually only met a handful of photogs who would use this.
Even then, ide consider this a glorified learning tool/strategy.
When I was a wee lad, I marked every exposure in a small journal (5 for 1$)
I did not own a light meter, and it helped me get an eye for ambient light.
A big part of learning this information, has to do with how you organize it and the process of making this system personal. Although place holders are convenient, I see no merit in the premium over a 20cent notebook. So I do have to agree with icebear, it's a glamourous solution for a insignificant problem.
Don't get me wrong,
Put your name on it, if it sells, you've got us fooled.