My sister made a gorgeous mobile for my baby, but it wasn't sturdy enough to hang over the crib. This product was great because it provided us with a safe and stable mobile mechanism from which we could hang all of the beautiful things she had sewn. We were excited that it played "You are my sunshine!" which fit right in with her original theme for the mobile (hot air balloons, clouds and a big sun in the middle. We chose the extended size because of the length of the toys my sister had sewn. It works beautifully and my baby is mesmerized each morning when I wind it up and her hot air balloons fly over her head. It should also be noted that while this is the extended size, you can easily leave out one of the extender rods and make a shorter mobile. Shipping time was great--product came without assembly instructions but was very easy to figure out how to put together. We love it.