Based On 2 reviews.
When it flows smoothly the ink (I got mine in blue) is beautiful. If find, though, that it often skips. I'm writing both in a Komtrak notebook journal and a Rhodia notebook. It may skip less in in Rhodia. I have tried changing the angle of the page on which I am writing or pressing harder, yet it still skips about 20% of the time. The size is medium.
I did not have this problem with the Cross rollerball that I have used for the last several years.
I have used Monteverde refills and waterman. These Schmidt refills are the best I’ve ever used by far.