I've been using the Cirqa for several weeks and it has become an invaluable aid. The guidance on sleep as well as the detailed data on many aspects of overall health has encouraged me to adapt my behavior. This is greatly superior to the Fitbit/Google Health which I've used for many years. Excellent!
Purchased and used for the past month, love the fact that it has a smaller footprint and no screen as compared to my fenix. However, there is a big drop off in measurement accuracy, especially with the HRV readings. After doing some reading it appears that the hardware is on the inferior side. The only way to get similar HRV readings is with a armband strap, that is currently backordered through garmin for months.
Battery is no good. Ten days? Not even close. Four days at the most. I may only keep it to give my Fenix 6 a break but I am seriously considering returning it. Will not recommend.