Happy PPF, friends! I'm not a big fan of plastic pens, but there's something about the TWSBI 580RB that grabs me. Its predecessor, the 540 ROC, was a celebration of Taiwan's 100th anniversary (ROC = Republic of China). As with the prior model, the color scheme and the symbol on the cap are from the Taiwanese flag.
It feels surprisingly substantial. It's large -- over 5.5" capped -- and features an integrated piston filler, an enormous ink capacity, and a big, smooth, shiny steel nib. TWSBI, pronounced "TWIZ-bee," had some trouble with the 540 cracking over time; I hope the enhancements made to the 580 are effective fixes. I'll be wicked sad if this one cracks.