Being the office fanatic that I am, I had to try these when I saw them. OMG am I glad that I did. These are amazing. I thought I loved my Sharpie highlighters but these are definitely better! There is absolutely no bleed through on any of the paper I tried and none of the ink of the pens that I typically use smeared. These highlighters will be the only ones I use from now on. I just can't get over how amazing they are and how well they work.