I've previously used the Sharpie liquid highlighter. The Staples brand liquid highlighter works just as well and costs far less. I like that it puts plenty of ink on the page versus the Sharpie brand. This does present a slight problem if you're highlighting text on a duplexed page. The ink does run through the page; however it's not that bad. I recommend this product to anyone who has to highlight a large amount of text and wants to save a buck or two per package. Perhaps a college student.
So easy to use because they are thinner than many highlighters. I love being able to get all the colors at once. We use them to color code a variety of things.