I am an elementary teacher who has been nannying for the past 15 years. I think this shape sorter is excellent for beginning understanding of shapes. Each of the shapes is a different color, however the plastic background is white. This is good because then they have to match the shape not just the color. If you would rather it be color coordinated, you could always stick a sticker matching the color onto the plastic background. There is one thing they could do to improve it. The circle and triangle each also fit in the hole for the square, and this confuses the toddlers. If they had made the square slightly smaller it would have solved this problem. As long as they start with the square, there should be no confusion. Oh well. It's the best I've found yet for a first shapes puzzle. After they master this, then they can move onto the ones where the shapes are parts of different objects. (Melissa and Doug has a fabulous puzzle that can also be found on Amazon.)
When I purchased this puzzle for a one year old, my intent was not to present a new "learning opportunity" with a toy, but to reinforce a motor skill that she could do by herself and achieve personal satisfaction.