DiDO F8 0.96 inch IP67 Waterproof Smartwatch, Support Blood Pressure Monitoring / Sleep Monitoring / worth to buy? Thanks for it if those of you who have purchased DiDO F8 0.96 inch IP67 Waterproof Smartwatch, Support Blood Pressure Monitoring / Sleep Monitoring / could share about what you think of the product. I would love any extra info, as it is quite pricey as $33.00 and I just want to know it is good before paying for it.