Other than the pen not being my preference in terms of writing instruments (I usually stick to fountain pens), I've actively used everything in this collection.
The items with the most surprising quality are definitely the paper clips. Not only are they beautiful, they're sturdy, too. These aren't your dollar store paper clips and you only need to hold one in your hand to be able to tell. Another highlight in terms of quality is the notebook. The carboard cover is sturdy, it lays flat, and, as an added bonus, the paper is fountain pen friendly! For reference, I use a western-size medium nib with Diamine brand Onyx Black ink. The feathering is so minimal, only the pickiest of fountain pen users would have a problem with it. Also, there's little to no ghosting once you turn the page.
Overall, I highly recommend this product. The noebook alone is worth at least half of the entire purchase price.