I bought this bank for my son last year when we were saving for our next Disney trip. He was only 5 at the time and was just learning how to count money. I liked this particular money jar because it's designed specifically for kids. It's got an interesting pattern on the lid and you can see through the jar to watch the money grow.
You have to put one coin at a time through the lid, and it automatically adds up your total and shows it on the digital screen. However, it does not add dollar bills. If you put any in, you will have to keep track yourself. You will also have to keep track if you take any money out because there is no way to subtract from the total.
Overall, it was a great learning tool for my son and he loved watching the total get higher. It was also great for me because I didn't have to keep counting all that change. When it would get full, we would just empty it into a bigger container with a slip of paper containing the total. Then we would start over.
If you have young children, or even older children, I would recommend this product to help them learn to save. It's easier when you see that total get bigger!