Kingwear Wearable Bluetooth Smart Watch Waterproof Sport Fitness tracker for iPhone 4/4s/5/5s/6/6s/7 worth to buy? Thanks for it if those of you who have purchased Kingwear Wearable Bluetooth Smart Watch Waterproof Sport Fitness tracker for iPhone 4/4s/5/5s/6/6s/7 could share about what you think of the product. I would love any extra info, as it is quite pricey as $35.00 and I just want to know it is good before paying for it.