Honor Band 5 Smart Watch, Smart Watch with SpO2 Monitor Heart Rate and Sleep Monitor Calorie Counter worth to buy? Thanks for it if those of you who have purchased Honor Band 5 Smart Watch, Smart Watch with SpO2 Monitor Heart Rate and Sleep Monitor Calorie Counter could share about what you think of the product. I would love any extra info, as it is quite pricey as $39.99 and I just want to know it is good before paying for it.