This is my first TWSBI, and I'm impressed. I've handled an acquaintance's 580 and like that, too, but I feel the ECO holds its own. A nice piston filler that has a good, solid feel in my hand at a price competitive with other intro pens like the Lamy Safari or Pilot Prera. Writes smoothly out of the box, for me. I wouldn't hesitate to point my friends to this one.
Edited by spaceink, 21 July 2015 - 22:05.