The colors are great, I’ve left it open for a while without using it and they don’t dry out. It seems like they never will. Half my notes have been written with a black one and it still hasn’t ran out. It’s what i use for everything. I started incorporating more of the colors in my other notes.
You can use zebra on them and they don't smear!! You can see them through my leuchtturm notebook but that’s because of the way the pages are made, not the pens fault, i love the fact that it doesn’t bleed at all though, only slightly transparent pages.