These Crayola markers are magical !! For children this is the first impression from "oh it's magic." We draw and color appears gradually. I find the ingenious system, no risk of drawing outside the coloring book. These felts works THAT on special pages (there are many books on different topics). It is both awesome and very limiting. We must buy more books if the pens are useless. At the same time it's great when you have not the ability to continuously monitor the coloring activity. The child do what he wants we can safely leave.
The felts are of limited quality, say they largely suffice for coloring book but will be difficult to reuse later. After that also depends on the age of the child, the smaller tend to press hard on the mine while a child of 6 or 7 years will be less raw and felts take longer.
The colors are limited, but they are enough to reproduce the drawings of Cars notebook ... it just need to want to get overly creative;)
A nice concept that can be improved but for the price it's reasonable.
