I have been using Faber-Castell Pitt Artist Pens for a couple years now and I have to commend them on the consitent quality and uniform pigment they provide. I have had almost no problems with the pens even though I have used upwards of 300 of them in various colors. They are suitable for application on wood, paper, and canvas. They also benefit from the crossover pigment values shared by Faber-Castell's pens, colored pencils, and aquarelle pencils. This numbered pigment system allows for clear pen lines merging fluidly into colored pencil and/or aquarelle colorfields and shading. I have found the Pitt Artist Pens last longer and have stronger, more vibrant pigmented inks than their competitors, such as Sakura Microns. When added to the lack of a cohesive multimedia pigment scale for competing pens due to the lack of pencils allied to those lines, I feel Faber-Castell Pitt Artist Pens are head and shoulders above their competitors.