It is interesting to try! It feels smooth travelling across the paper, almost like a ballpoint pen. It didn't smudge easily; as a matter of fact, I wanted to smudge it, but the excess disappeared. I have a lot of regular graphite leads to go through so I won't replace mine soon, but I wanted to try this and was not disappointed.
As a Registered Nurse I go through a pen a week easily with the occasional need of a pencil on non legal documents. And I like to use the Dr. GRIP pens with the 4 different colored inks and a mechanical pencil all in one for the convenience of not stuffing my pockets with even more stuff and changing colors on the go as needed. In error I hit the mechanical pencil the other night and wrote several notes to the oncoming shift before I realized it was the pencil and not black ink. It's that smooth with that dark and crisp a line. And after I realized what I'd done, just out of curiosity, I tried to smear it thinking that would be the it's failing but it stayed beautifully on the page. I'm very impressed and will be buying more in the future.
When I first saw the price of these leads compared to locally available brands, I almost didn't buy it. But you definitely get what you pay for. This is the smoothest, darkest (for the grade), and all around best lead I have ever drawn with. Now that I've tried it, I don't want to put anything else in my pencils.