Waterproof Bluetooth Smart Watch Phone Mate Fitness Tracker For All Smart Phone with ECG, BL Headset worth to buy? Thanks for it if those of you who have purchased Waterproof Bluetooth Smart Watch Phone Mate Fitness Tracker For All Smart Phone with ECG, BL Headset could share about what you think of the product. I would love any extra info, as it is quite pricey as $21.00 and I just want to know it is good before paying for it.