My daughter is nearly [...] and she loves her magna doodle. She likes drawing, but whenever we got the crayons out she'd spend more time trying to eat them and breaking them, than actually coloring with them. Plus, she's still learning how to press down hard enough when she draws to make her crayons really show up. Of course, she's only capable of scribbles now, but the magna doodle is great for that. We've got the mini version, that has no stamps to loose, and it can actually be clipped onto her diaper bag so we have it wherever we go. Most of all, we enjoy having her sit on our laps as she watches us draw simple pictures, and then we ask her what the picture is (kitty, kite, flower, house, etc.), and then we just swipe and draw a new one. We've even started using it to teach letters, numbers and shapes. She really seems to enjoy it.
Our magna doodle is aged 3 and up, and I imagine it is because of the string that keeps the pen attached. It could be a strangulation hazard, so we always supervise our daughter with her magna doodle. And we have to make sure she never steps on it or damages the screen in any way. Occassionally, the screen needs several swipes before it clears up, but that is no big deal.