Overall, I am pleased with this product and would give it an Excellent rating after some minor improvements. I love the fact that it has sensors and is actually measuring things rather than extrapolating results. That said, I often have gaps in data recording (particularly SPO2 that last an hour or so. This also occurs with HRV. I wish that the sleep graph attempted to separate out REM rather than just 2 categories (light & deep). I wish that the band was more like an Apple Watch band making it easier and more comfortable to wear. The purchasing experience was not as smooth as it should have been, and I wish that the online chat help was more robust and responsive. There is much to unpack with this device and the tutorials and online help could use some improvement. The web app is pretty good but, can be confusing .. for example, why do I not receive Temperature data? I suspect that I need another device for this but, my point is that it can be very confusing. All in all I would recommend this and have found the data to be quite useful to me to manage my health.