DiDO G19 IP67 Waterproof Smartwatch Bluetooth 4.0, Support Blood Pressure Monitoring / Sleep Monitor worth to buy? Thanks for it if those of you who have purchased DiDO G19 IP67 Waterproof Smartwatch Bluetooth 4.0, Support Blood Pressure Monitoring / Sleep Monitor could share about what you think of the product. I would love any extra info, as it is quite pricey as $70.50 and I just want to know it is good before paying for it.