The pens are fantastic. So far, Ive only used them with cartridges of blendable inks that Pilot produces specifically for these pens. I bought converters for each pen, but haven't used them. Not all inks are chemically compatible to best take advantage of the pen's design. Packaging the pens with this notebook is a recipe for frustration. Moleskine notebooks are notoriously finicky about what media the paper tolerates. Considering the cost of the notebook compared with the pens ... In my opinion, it's wasted money. I will be buying these pens for a gift, but not from Massdrop, as I have no use for the notebook, and refuse to include it with the gift.