Read Ed’s review of the TWSBI 580AL. He waited until owning and using the pen for a year before reviewing, which I appreciate since mine is less than a year old. His experience fairly matches mine, including the ink currently in the pen, except I did not have to modify my nib. It’s one of my favorites to use and the ink sloshes satisfyingly in the crystal clear barrel.
You can get the TWSBI 580AL directly from TWSBI or from Goulet Pen for $60.