I used to have quite a collection and carried one with me all the time. The problem is unless you are in the minority these days everything is pretty much done on computer and the only time I ever used it was for the rare signature. They would wind up getting clogged and were more of a pain then they were worth. I sold all and now I have just two a vanishing point which is presently clogged because I use it so little and a Pelican that was sold as some high tech docking station piece that never worked very good anyway.