I was never previously a fan of fine tiped pens. Now that I'm doing more and more with planners, journals, and especially bullet journals, I'm realizing the importance and benefit of fine tipped pens. This set is great because it comes in various sizes so that you can really tailor what you are doing. All the ink is black, so even if you start with a think tip and realize you need to go thinker, that isn't a problem at all. You just go over the lines.
There are a few colors that I frequently use. It would be nice if these packs came in various color options. That is really my only complaint. The cap and the barrel of the pen both have the tip size so you should always know what you are grabbing. This makes it even easier when you are working an have multiple pens laid out that you know you are going to use.