Bests & Worsts Reviews from Amazon

This thing is packed with so many great features! 09/25/2021 Edit: Blood Pressure I've seen others post that the blood pressure function was not reliable for them. I've even read some recent studies that show a pattern where the light-based method of measuring BP was just not as reliable as first hoped. The issue I have found is that BP can be dependant on many factors, like where on the body the measure is taken, time of day, etc. I often get very different readings between arms, or when using the ankle. For me, individual readings are less important than the trend over weeks/months, so I would say that this device should not be used for things like BP warning alarms, etc. instead use it to view the data as trends. The only downside is that it only seems to record 3-days worth of data, and I couldn't find any way to export that data for reporting to my physician. Its "share" functionality is basically the equivalent of taking a screenshot in the app. I read something about cross-app compatibility but haven't looked into that yet. ***But hey, it's $45!!!*** I was very pleasantly surprised by its sleep-tracking functions. It records any instances of apnea, and has an alarm so if you go into hypoxia it vibrates and wakes you up! For this price, the lack of data export/reporting isn't a deal-breaker, and surprisingly good heart rate, O2, and sleep-tracking make it a steal for the price! Update: 09/25/2021 Can't tell you just how impressed I continue to be with this device. I've even had the most uncommon experience of battery life IMPROVING over time. When I first starting using it, it would hold a charge for maybe 2-3 days, but now I'm getting 5 days very consistently. I haven't noticed any firmware updates (unless it's automatic?) I suffer from tachycardia (fast pulse), which means any time I need to take a decongestant I pretty much need to be bed/couch-ridden but using this device I was able to set an alarm for high-pulse. Yesterday it went off, so I was able to rest and relax until it went down, but otherwise, I was able to go about my day. That's such a big deal to me, that I thought it important enough to come to update my review.