I have been fascinated with them for a LONG time, they work like a colored pencil, watercolor pencil and ink all at the same time. You can lay down color then go over it with water like watercolor, then once it's dry, the pigment is permanent like ink.
I played around a bit with them as soon as I got them home, here are the two things I did, both are flowers, you can click the image to view full size:
The next flower below, a nightshade that resides in my front yard, that was done on Strathmore Mixed Media 300 series paper, 9"x12", vellum surface, now THAT is some paper to use in this method, it IS thick, smooth, takes the colored pencil well and more importantly, it takes the moisture well without buckling or falling apart when you go over it multiple times.
I used a waterbrush to activate the pencil to ink, you can see my waterbrushes 2 pictures above, they are on the left of the computer, one has a blue band and the other has a red band, there is a third in the set. An idea I had and it works is to use a Koi colorless blender brush pen to do some of the fine work, it blends the pencil/ink without causing it to bleed, I was very impressed with how that worked. Hopefully with my new camera, and if I can find my tripod, I'll make an attempt at doing a video
I am quite happy with them, I'll go over to my friend's house tomorrow and we can both play with these pencils, I can't wait to see what we create.