I love the fact that these come sealed so that you know your fluid is there. It is also great that you can actually change the size of the tip so you are actually getting 2 in 1. The only thing I don't like, it's a personal preference, is the diameter of it. But I understand the purpose being for it to hold more. But I just don't like trying to write with something this fat! Like I said that's just me...Great product & caring company very prompt in sending a follow-up message after delivery even giving instructions on how to use.