Marathon and Marathon Plus are very different. The Plus have a ridiculously thick and heavy (i.e. slow as molasses) layer. I've seen a cross-section in a shop, those things are THICK. I happen to use the Marathons (NOT Plus) on our two folders. They're quite durable, and deal with glass quite well, but don't expect them to stop a big nail or screw or something like that.



^^^^^^^^ Pic of Marathon Plus from this page.