It's a big improvement, especailly with 0.2mm lead, which wears down faster than thicker leads. The result is that you don't need to push the button, you just keep scribbling. Each time the tube is pushed back a little, as you use up some lead, it's pushed back to full-length when you lift off the paper, pulling the lead forward with it. The Orenznero adds an auto-feed mechanism to that system. Because the lead is always protected, there's a much smaller risk of breaking it, even with very fine lead. The tube is smooth against the paper, and just pushes back out of the way as the lead is used up. Instead of pushing the button until the lead extends out past the tube to write or draw with, you leave the lead fully wrapped in the metal tube, where it's protected. In the standard Orenz pencils, the lead support tube is carefully rounded and polished at the end. And with Pentel's new ultra-thin 0.2mm lead, the problem would be far worse, making them quite unusable for almost everyone, if not for the Orenz lead support system. For many others, they're just too thin to be practical.
For those with a light hand, who love thin lines, it's worth it, and 0.3mm leads have been in use for years. A masterpiece of miniature engineering, the Orenznero makes super-thin leads usable! Usually, with 0.3mm lead, it's easy to snap the lead as you write or draw.
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