I don't. I got a few to try out and almost hated them. The ink smears if you run your hand over your writing without letting it dry for a moment, mine would get a ball of ink on the tip which would then leave a blob on the paper, and they wouldn't write on any very smooth or polished or glossy paper. There were almost no redeeming qualities to them that I could find, and plenty of disadvantages. On the other hand, I just picked up a pack of Zebra Z Grip pens yesterday. These are nice. Smooth writing, no blobbing, writes on polished or glossy paper... I think I'm going to like these pens.