KW99 1.39 inch AMOLED Screen Display Bluetooth Smart Watch, Support Pedometer / Real-time Heart Rate worth to buy? Thanks for it if those of you who have purchased KW99 1.39 inch AMOLED Screen Display Bluetooth Smart Watch, Support Pedometer / Real-time Heart Rate could share about what you think of the product. I would love any extra info, as it is quite pricey as $142.57 and I just want to know it is good before paying for it.