Solid colored markers work well, but metallic colors are HORRIBAD. No amount of shaking will allow the paint to mix evenly with the metallic powder (or whatever they want to call it...) and when you write with it you'll mostly get silver despite the color you have.
Bulky, so if you're more comfortable with smaller objects in your hand get the mini version.(AP Reply) That's interesting to hear. I find the Metallic Blue and Metallic Purple to be the best flowing of the bunch.