Recently I acquired a uni-ball Kuru Toga mechanical pencil (0.5mm) to replace my trusty Pentel P205 that I have been using for a very long time. The Kuru Toga is advertised as the “The most advanced refillable mechanical pencil ever” – so my expectations were high. As an engineer, I appreciated the new technology used in this mechanical pencil. The Kuru Toga has an exclusive and patented rotating mechanism (aka the Kuru Toga Engine) that as you write, it rotates the lead to maintain a sharp point and avoid flat spots on the lead. They claim that this also reduces lead breakage. To also reduce lead breakage, the starter set includes “diamond infused lead”.
The Kuru Toga is physically thicker than the P205, and has more plastic components, making it feel cheaper. The writing quality is very good. The slight rotation of the lead every time you lift up the pencil is good, and does keep a dull spot from forming on the lead. This allows for continuous writing and one does not have to rotate the entire pencil. It took a little getting used to, but it is all that I use now. The other aspects of the pencil are fine, such as loading of the lead and the eraser. It is available in 0.5mm and 0.7mm sizes. Other models of mechanical pencils from uni-ball are available that use the Kuru Toga engine (i.e. the Roulette Model), and these are heavier and thus will feel more solid in your hand.