The reason I like these pencils so much must be the fact that I like to use them for drawing and sketching (which is basically what they are made for!). But strangely, I also like to write with them, so they can basically do everything I need a pencil to do. I also like the way they look and feel, it's a solid brass mechanism, which makes it very heavy, and it has a sturdy aluminum barrel, available in different finishes. Oh, and it's reasonably cheap!
Another thing I like about lead holders, is the fact that they can be sharpened in a more traditional way, using a piece of sanding paper (they sell small wooden planks with some layers of sanding paper on it, in almost every artist's supply store) And I really like to take my time and think of new ways to sharpen it to a more effective point.
I also have some other 5.6mm leadholders from Koh-I-Noor and other brands, so if you'd like to read more about this type of pencils, let me know in the comments below. And don't forget to subscribe to my feed if you want to stay updated about my blog!