There was so much hype over these when it first came out. And at first I thought they were awesome - because it actually erased pen mark ... but then I realized how easily they dried out ! Also, your notes may disappear under heat ... I had a plate of hot food that sat on top of my notes, and I ended up losing a chunk of it where my food sat. Also WAAYYYY too expensive for these pens (especially considering how fast they run out of ink or just dry out)