Oh man, totally agree. What wren728 said about the noise is so true, mine used to make this awful scratchy sound on certain papers. The teflon one just slides so quietly and evenly, it's kind of amazing. It doesn't catch on paper fibers at all, which makes folds so much sharper. Such a simple swap but it feels like a huge upgrade.
Yeah the no marks thing is huge. I never realized how much the slight scrape of a bone folder bothered me until I switched. Is the Teflon one way quieter for you too?