The best feature is that you can leave it uncapped for days without it drying out, because I've definitely ruined more than one permanent marker by getting distracted and walking away. It's got a nice pretty thin line which makes it easily legible. I'd say the cons are that it's not that black, black color that you usually expect from a permanent marker, and it seems a little dryer than your standard marker, though that probably comes from protecting it from drying out if it's uncapped.