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I purchased a bunch of these markers a couple of days ago and i can't rate them highly enough! They're fantastic.
The main selling feature of these pens is that they work on nearly every surface imaginable, including Paper, wood, glass, fabric, metal, plastic and the list goes on. This is because they're acrylic paint markers and not the usual ink based pens. For each surface there are different methods on sealing the paint, for example with Fabric you apply the design and simply iron over the back of it; this helps seal the design and prevent it from damaging in the wash (you can see a full list of recommended tips on their website). POSCA pens are also available in numerous colours and sizes, from 1mm nibs to 15mm giving you a varied choice in line thickness. They're also non-toxic meaning they're safe for young children to use (although i'd make sure you keep an eye on them when using these pens, you don't want it ending up on your furniture!).
What i also like about these markers is you can draw directly on top of another colour without the worry of the colour underneath showing through; perfect for correcting mistakes!
Each pen needs to be prepped before using but there are handy illustrations on the side of each pen to help you. You simply shake it (with the lid ON), press down on the nib a few times until the paint begins to flow, then you're done! If the nib happens to dry up or you lose the lid, you can press down on the pen to get the paint flowing again, or for those really dried up nibs you can simply take it out and wash it under some water.
The only downside of these pens is it's not particularly easy to find somewhere that sells them and once you do, they can be very pricey, ranging between £2 - £4 PER MARKER! However if you're a creative enthusiast, i'd definitely recommend purchasing these pens, they're well worth the money!