Aquadoodle Drawing Mat

I bought this Aquadoodle drawing mat for my grandson.He loves to draw and this is perfect for a three year old because I don't have to worry about him coloring on things that he shouldn't.The mat is very large at 32" x 32". The pen is easy to fill with water.The water is all that is neede to activate the color on the mat and when it dries the drawing disappears and can be used over and over again.I like the fact that the pen is only filled with water, so I don't have to worry about him leaving the cap off, because there is no ink to dry out.The only drawback that I could see with some children, is that they may be disappointed when the drawing disappears in less than a minute.But my grandson doesn't seem to care.He thinks it's kind of neat how his drawings disappear.