We've used expo markers for as long as I can remember. It's always nice to be with a brand who you know what to expect from and that's how it is for me with expo. The chisel tip marker is great, you can write in a thick or thin line depending on how you use the tip. 

The black ink is clear, and doesn't have a noticeable smell from my experience. These also last a lot longer than the cheaper brands that you can get which don't have nearly as much ink in them. 

You can't go wrong with expo, would definitely buy again.