I found the whitelines site last year but could buy the products without expensive shipment costs. Last week I found out that amazon.de sells the products and with the free shipment to the Netherlands I couldn’t wait any longer. I bought the lines A5 hard bound.
Yes, being Dutch I like the orange color in the Notebook;-)
An improvement would be to add more lines on a page. I normally use the superb notebooks from Ording & Reda which has a much higher density in lines. The Moleskine notebooks also have a perfect lining (but truly inferior paper for use with fountain pens).
However, the paper is good!