This mat is so cool! My son loves it. And so do I.
It is a nice, large size. There is a pretty sizeable border around the part of the mat that is just design and not able to doodle on, but the mat is so large that they doodle area is pretty roomy itself. It comes with 4 water markers. Enough to save a couple for extras just in case. The tops of the markers are easy to open in order to pour water inside. My only gripe is that it is labelled incorrectly. It has "on" and "off" with arrows indicating which direction they go. Only you have to use them in the opposite way. Twist the "on" way to unscrew the top, and twist the "off" way to screw it back on. A minor hinderance since it only took me a couple seconds to figure it out finally.
It is fascinating how you can color with water. My son loves to play with water as it is, but now he can color with it. He spends much more time coloring on this mat compared to just doing regular coloring with crayons and paper. So this mat keeps his attention for a little longer.
I did notice that it may take a while for the mat to dry in order to be reused again. I am not sure if it was because I left it folded overnight and that hindered the drying process in some way. Or if my son and I used too much water in some places and need a loinger drying time. But leaving it to dry overnight did get most of it dry for reuse.
Overall I like this mat, and my son loves it for sure. It is a neat way to color and use water that doesn't make a mess.