does anyone here have any experience with the 6 sheet Grafmatic film holders? It seems like a pretty awesome way to store more in less space with less weight than the equivalent. And do they make it in 8x10, if yes then id say that would justify making the leap to that and staying up in that format for a while. I'm getting my purchasing list together and i found the aforementioned product. Lastly, Those who use them, how do they perform in terms of film flatness? If poor, what holders or tricks would you suggest of flat film? I hear 8x10 can have some sagging issues and popping when the temperature changes.