A rollerball that takes fountain pen ink -- too good to be true? Not in the case of the Mega Inkball. After the very first fill, it wrote smoothly and, after the first sentence, skip-free. The set comes with one barrel and cap, four nib sections, a small jar of black ink, one ink converter, and two standard, international ink cartridges. The resin barrel is handmade, and luxuriously thick and curvaceous (maybe too thick for some hands). The metal trim and clip are chrome-plated ("jewelry-grade," according to Monteverde). A high-quality touch is the spring-loaded clip. Overall, the pen feels tight and solid.
The tungsten carbide rollerball appears to be foolproof. Ink flows smoothly and consistently even as I changed writing pressure and speed suddenly. The line weight remains virtually consistent as well. The only hitch came when switching from very heavy to very light pressure. For the next few strokes, I got some breaks in the line. The inkflow is conservative, too, producing a fine line and less bleed-through compared to either standard-nib fountain pens or inexpensive rollerballs.
Since the Mega Inkball is, at heart, a fountain pen, you must take all the usual precautions of working with fluid ink: Don't carry it less than 100% full on airplanes; watch your fingers when filling it from an ink jar. The four included nibs are identical. Each has a lifespan of about 1 km of writing (which translates to roughly 200 handwritten pages). If you change colors a lot, you can use each nib for a different color, by using cartridges or buying extra converters.
The Mega Inkball comes in burgundy (pictured here, $175) and black (the black model is larger, at $195).