The rollerball writes significantly more lightly than the ballpoint because its ink is more fluid and approaches the writing feel of a fountain pen. The disadvantage is that the ink runs and bleeds more easily on poor paper and that the refill is comparatively quickly empty. Constructively both models differ in that the rollerball has a screw-off cap while the ballpoint typically works with a twist mechanism. Writers who get along well with it appreciate it as a high-quality alternative to the ballpoint in everyday life.