The only complaint, if you can call it that, is the size of the nib. I only wish it was a #6 size. Other than that, it writes well. Can't get over the colors. Keep looking at the pen, even when it is not in use.
TWSBI Diamond 580 Iris Fountain Pen
The Diamond 580 is one of the best pens on the market. Amazing writing experience, looks amazing with the Diamond cut barrel and the sealing system keeps your ink fresh for a very long time. I own a lot of Diamond 580 and Diamond 580ALR pens in various sizes. An iris colored pen really like this is a great addition to the line up and to my collection. Thanks TWSBI!