Between coloring, my bullet journal, and other arts and crafts that I do, I end up using a ton of fineliners. I never really know what to think about the ones I haven't tried before but have a slight addiction to them so I usually buy any finaliner that I see available. Admittedly, I'm not ever good at picking between .3 and .4 and am not convinced that there is even a noticeable difference. These are some of my new favorites though. I love that they come in a storage case. So many of mine are in a huge storage bag that I have trouble taking them with me if I'm planning to work on anything anywhere other than at my home. Since these came with their own storage, these will most likely end up as my designated travel set. The colors they product are amazing and I haven't noticed any feathering or smudging, regardless of the paper type I'm using. The do bleed through some of the thinner papers but that is to be expected.