While experimenting with my markers, I found that I enjoy using them on trace paper and vellum the most since they blend much easier on these soft papers. Bristol gives the markers a harsher, more clean-cut look which can be nice if that's the appeal you're looking for. I can see how the blending tool could come useful when you're trying to achieve a tint of a certain hue. The blending marker is also helpful when trying to convey your colors in a not-so harsh way.