I bought this 'fitness' tracking watch for two purposes that were advertised features. 1) alerts that my stress level is increasing, so I can take action -before- I end up nonfunctional due to ptsd induced stress. Did I wrongly assume that this watch is able to detect metabolic changes (heart rate, hrv, sweat, etc) that indicate increasing stress, and then alert me before it's too late to practice de-stressing techniques? To my surprise the **ahem** watch wants me to tell it when I feel stressed! I assumed it was supposed to learn from my feedback, but after 4 weeks it's as dumb as when I started. 2) where the hell is the, so called, readiness (premium subscription) score? After wearing it continuously for a month, it still tells me to wear it at least 14 hours per day and during sleep in order to get a daily readiness score so I know whether or not I can do an intense workout. Well I have worn it continuously and properly, and I got readiness scores for just 2 days out of 20+ after the baseline period. I can't believe this is a premium feature, and I certainly would never subscribe to the 'premium' grift.
Beyond these issues, I know it is not possible for this watch to capture accurate ecg and associated hrv because no watch can do so, as it requires several sample locations closer to the heart to get accurate heart activity readings beyond a simple heart rate due to all of the 'noise' that the watch must compensate for just to measure pulse rate. This is why true medical ECGs and stress tests are done with 12 leads, and accurate ecg and hrv require a chest strap at a minimum. Any device that sits on just one body location can only be for "entertainment purposes only". After comparing the Sense 2s accuracy vs my Polar H10 chest strap during HIIT workouts, the difference in measurements is beyond disappointing. Given all the other reported problems and false feature advertising, I don't see the point in keeping this joke of a product that Google will likely further cripple in order to protect sales of the official Google watch. So will be returning. Thanks Google/Fit**ahem** for all of my time you wasted.
