I have had this slumber buddy frog for about a year and a half now and it still works perfectly! My 20 month old has grown very attached to this and it really helps him sleep - it has become an important part of his daily routine. He likes one of the lullaby's specifically for nap time and another for bed time. We use the music part of it every single day at least 4 times a day and the lights along with the music only occasionally when he goes to bed, but the batteries always last at least a month. I would agree that the only downfall is that the music doesn't last but maybe 20 minutes, but that is how most of these types of products are. If you're looking for something to play music longer, I'd invest in an actual CD player and lullaby CD's... But for us, it hasn't really been much of an issue, and my son loves this even as a toy. This was definitely one of the best purchases that was made for our son.
I don't know who loves this more - me or my baby! I didn't realize that this has lullabies and nature sounds in addition to the heartbeat which is perfect for late night soothing for my newborn.