Digital Wristwatch 1.3inch BT Smartwatch with Heart Rate Blood Pressure Monitoring Movement Track worth to buy? Thanks for it if those of you who have purchased Digital Wristwatch 1.3inch BT Smartwatch with Heart Rate Blood Pressure Monitoring Movement Track could share about what you think of the product. I would love any extra info, as it is quite pricey as $15.20 and I just want to know it is good before paying for it.