Before I got this I collected all my money in an old CD box, so when I wanted to know how much I had saved in here, I had to count every single coin and it used to take me ages to do it. Now I have a running total of all the coins in this jar and every time I put a new coin in it tells me the new total. The only thing with this jar is sometimes if you push a coin part way through and then take it out again it will still register a coin (I occasionally passed 10ps off as 5ps this way when I first put my big load of coins through). It even lets you adjust the amount when you take money out. Great fun for kids, and a good way for them to know how much money is in there.