Apparently Smart Beat is pretty new because I wasn't able to find much by way of reviews, but I figured with the 90-day return policy I had nothing to lose. (I double checked with their customer service and they said they'd honor it even though I bought off of Amazon.) Really glad I took the leap! I went into my daughters room and watched her breathing, comparing it against the chart. There's a second or two of lag, but it looked like it got every single breath, just like they said. Maybe I'm more prone to anxiety than most, but I could feel my worry evaporating off of me. I am gonna sleep like a log tonight!