Mikhail100. I have the 24 hour tin cloth briefcase in Navy. I've had it for about a year now. I also liked it because of the outer pockets. The Original briefcase (256) was on my very short list and I did have one for a couple weeks but I didn't like the fact that there were no outside pockets - there just wasn't enough space for chargers, and the extra stuff that you end up carrying every day. The outside pockets on the 24 hour bag are perfect.
Regarding wear and tear of the Tin Cloth compared to the 22 oz twill. There is no doubt that the 15 oz tin cloth will wear a bit faster than the 22 oz twill. Simple physics. In fact, the bottom corners (which of course get the most wear) are starting to wear down a bit - but it's not all that bad, honestly. (I can post some close up pics if you're interested). The rest of the bag is just perfect for me.
I get the feeling that I'll eventually want a different bag but that's more a matter of my personal desire for occasional change than anything to do with wear and tear of the bag.
I find the quality of the bag perfect. Note: this is not one of those highly polished, amazing leather, high end bags you see out there. (like a high-end Gucci leather bag, for example). It's a Filson. It's got a certain character to it. You can feel good in the boardroom or the outdoors. In a suit or jeans and a sweater. I am very rough with my Filson(s). Last night, for example, I was flying back from Charlotte and just jammed it into the space under the seat in front of me. I don't worry about babying it - I just cram it in there. I know it's going to come out OK - and will look no worse for the wear. In fact, it will look even better.
Will this bag last 25 years? Yes - it will - and if not, I'll send it back to Filson and ask them to stitch it up and send it back. No problem.