There is a lot to love about the pen, reducing waste and promoting sustainability are great ambitions to support, but there are some practical limitation's that test the resolve of this stationery addict. The lid is an add-on, so without it you risk ink leaking in your pocket and damaged nibs. The pen is too short and holding it is uncomfortable if you are using it for any extended period of time. It would be better to extend the length and enable the lid to sit on the rear of the pen, extending the length and making it more comfortable. That said this is a solid little item that adds a little smile with use, less likely to leak than a fountain pen, more adaptable for the quick swap out of nibs and the versatility of re-use and different colours are very cool. You'll need to put more effort into owning this over the dreaded biro, but it is worth the effort. I have two different pens from Tom's Studio and if they can keep iterating I think there is a very good chance they might make the perfect pen, so I might add to my collection soon!