F28 Smartwatch with Heart Rate Monitor Blood Pressure Clock Smart Waterproof IP68 Physiological Cycl worth to buy? Thanks for it if those of you who have purchased F28 Smartwatch with Heart Rate Monitor Blood Pressure Clock Smart Waterproof IP68 Physiological Cycl could share about what you think of the product. I would love any extra info, as it is quite pricey as $51.55 and I just want to know it is good before paying for it.