Q1plus BT 5.0 Smart Wristband Bracelet IP67 Waterproof Passometer Blood Pressure Heart Rate Sleeping worth to buy? Thanks for it if those of you who have purchased Q1plus BT 5.0 Smart Wristband Bracelet IP67 Waterproof Passometer Blood Pressure Heart Rate Sleeping could share about what you think of the product. I would love any extra info, as it is quite pricey as $17.99 and I just want to know it is good before paying for it.