Smart Bracelet, Heart Rate, Blood Pressure, Blood Oxygen, Real-time Monitoring, Multi-sports Mode, C worth to buy? Thanks for it if those of you who have purchased Smart Bracelet, Heart Rate, Blood Pressure, Blood Oxygen, Real-time Monitoring, Multi-sports Mode, C could share about what you think of the product. I would love any extra info, as it is quite pricey as $69.99 and I just want to know it is good before paying for it.