Some things you should know-
-the pens are refillable!!!!
-always store the pens FLAT
-MAKE SURE YOU PUT THE COVER BACK ON TIGHTLY as it's a PAINT pen and it WILL DRY OUT if you don't
-the pens write on a variety of surfaces (check out the neon pink and yellow above that's on paper, tape and transparency.)
-It's a pump and shake system (similar to the Sharpie Paint Pens)
-You can change the tips (the pens are available in different tips sizes as well)
All in all, the pens are quite yummy. They're expensive but with care, they should last you a long time. I'm hoping to add to my collection soon!
More on the Molotow site here.