IMHO, complete crap. I've had two of the matte black pocket bullet pens, and they skipped worse than any pen I've ever had. In fact, any cheap pen I've had worked tons better. I finally heard from someone that the no-name generic Space Pen fillers you get at Office Depot work much better than the real Space Pen fillers, and I've found they in fact do. That's all I use in my Bullet Pen now, and it finally works like it's advertised.