When the pen works, it works great. But I bought a pack of three for the 0.5 mm and all of them lost the ball at the tip long before they ran out of ink. They were not dropped or had anything happen to them that would cause that. Also, the pen itself is fragile and breaks if moderate pressure is applied to the plastic casing. There are plenty of 0.5 mm pens out there and although I like the quick drying ink and the way it writes, unless I find out they fixed the problem, I won't be buying them again.
