I love the Precious Planet theme and received this mobile at my baby shower. It was easy to assemble and fit my son's convertible crib. However, the mobile would never stay on for the promised 20 minutes. Over the next few days, it would run for shorter and shorter amounts of time, until I was having to turn it on every 20 seconds or so with the remote or by sliding the switch off and then back on. Needless to say, this was defeating the purpose of a crib mobile. And yes, I tried switching out the batteries.
I wanted to give this mobile a second chance and exchanged the one I had for a new one. The new one worked just as promised from the moment I took it from the box. It runs for the full 20 minutes, offers exciting variety for my son, and he loves it! Depending on his attention span for the day, sometimes it only holds his attention for a couple of minutes, but other times he's still looking at it when it shuts off. He seems to especially enjoy the polar bear toy and nature sounds. As the parent, I appreciate the variety of music/nature/heartbeat sounds...listening to the same thing over and over can get old pretty quickly.
Overall, I would recommend this product to a friend with the disclaimer that I had to buy it twice before I got a good product. But when it was good, it was great.