I would say the first day was awesome! She fell asleep quickly for naps and even took her cat nap that day (which she had sort of been fighting for the last week). She doesn't like to sleep on her tummy, only her side and back, so this works well for us.
If your baby likes to sleep on their tummy, I'm not sure it would be worth the $$$. Also, I noticed when she cried, she would take deep gasps of air when wearing this which concerned me a bit.
Overall, I think it's a pretty great product but I...