The Jetstream from Uni-ball is one of the best overall rollerballs I have found. With its comfortable and attractive design in black(for 1.0mm) and blue(0.7mm), and the tungsten carbide rolling ball which ensures brilliantly smooth writability, it is a must have. The only fault I can find is the occasional inconsistency of ink flow. Although this can be irritating I stopped noticing it not long after becoming accustom to it.